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Hemophagocytic lymphohistiocytosis

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40: 566: 782:, which can be used to estimate an individual's risk of HLH. In adults, soluble IL-2 receptor has been found to be a very sensitive marker for HLH, demonstrating 100% sensitivity for ruling out HLH below a cutoff of 2400 U/mL and optimal cutoff for ruling in at 2515 U/mL (sensitivity, 100%; specificity, 72.5%), with 93% specificity at >10 000 U/mL. 513:-dependent cytotoxicity. This inability to remove infected and antigen-presenting cells and terminate the immune response leads to uncontrolled proliferation and activation of the immune system with release of excessive cytokines. These cells then infiltrate organs, releasing more cytokines, which gives the clinical picture. The fever is caused by 143:
The onset of HLH occurs before the age of one year in approximately 70 percent of cases. Familial HLH should be suspected if siblings are diagnosed with HLH or if symptoms recur when therapy has been stopped. Familial HLH is an autosomal recessive disease, hence each sibling of a child with familial
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Bode SF, Ammann S, Al-Herz W, Bataneant M, Dvorak CC, Gehring S, Gennery A, Gilmour KC, Gonzalez-Granado LI, GroĂź-Wieltsch U, Ifversen M, Lingman-Framme J, Matthes-Martin S, Mesters R, Meyts I, van Montfrans JM, Pachlopnik Schmid J, Pai SY, Soler-Palacin P, Schuermann U, Schuster V, Seidel MG,
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Not all five out of eight criteria are required for diagnosis of HLH in adults, and a high index of suspicion is required for diagnosis as delay results in increased mortality. The diagnostic criteria were developed in pediatric populations and have not been validated for adult HLH patients.
833:(type 2). This is a rare autosomal recessive disorder characterized by partial albinism, hepatosplenomegaly, pancytopenia, hepatitis, immunologic abnormalities, and lymphohistiocytosis. Most cases have been diagnosed between 4 months and 7 years of age, with a mean age of about 17 months. 969:
A systematic review recently reported the pooled proportion are fever 97.2%, hepatomegaly 70.2%, splenomegaly 78.4%, thrombocytopenia 90.1%, anemia 76.0%, and serum ferritin ≥500 μg/L 97.1%. The case fatality rate is 14.6% among dengue hemophagocytic lymphohistiocytosis patients.
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HLH has a twenty-five–percent chance of developing the disease, a fifty-percent chance of carrying the defective gene (which is very rarely associated with any risk of disease), and a twenty-five–percent chance of not being affected and not carrying the gene defect.
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The diagnosis of acquired, or secondary, HLH is usually made in association with infection by viruses, bacteria, fungi, or parasites or in association with lymphoma, autoimmune disease, or metabolic disease. Acquired HLH may have decreased, normal, or increased
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HLH is a description of an immunophysiologic state in time. It can be dangerous to infer a genetic impairment of granule-mediated cytotoxicity in patients, especially older children and adults, who meet any of the various criteria for HLH. Thus, like
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Secondary haemophagocytic lymphohistiocytosis (acquired haemophagocytic lymphohistiocytosis) occurs after strong immunologic activation, such as that which can occur with systemic infection, immunodeficiency, or underlying malignancy.
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Benson LA, Li H, Henderson LA, Solomon IH, Soldatos A, Murphy J, Bielekova B, Kennedy AL, Rivkin MJ, Davies KJ, Hsu AP, Holland SM, Gahl WA, Sundel RP, Lehmann LE, Lee MA, Alexandrescu S, Degar BA, Duncan CN, Gorman MP (May 2019).
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The prognosis is guarded with an overall mortality of 50%. Poor prognostic factors included HLH associated with malignancy, with half the patients dying by 1.4 months compared to 22.8 months for non-tumour associated HLH patients.
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The underlying causes, either inherited or acquired, lead to an unchecked immune response when exposed to triggers. Impaired NK-cell cytotoxicity is the hallmark of HLH. All genetic defects for familial HLH are related to
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for four of the causative genes, PRF1 (FHL2), UNC13D (FHL3), STX11 (FHL4), and STXBP2 (FHL5), is available on a clinical basis. Symptoms of FHL are usually evident within the first few months of life and may even develop
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The vast majority of patients who meet these criteria will not have a genetic cause of their disease, but rather HLH will be triggered by infection, malignancy, rheumatic disease, and/or certain treatments (as in the
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Most patients who meet HLH criteria will have secondary cases. Treatment for these patients should focus on the underlying contributors. Additionally, treatment of the inflammation of HLH itself is often required.
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Both forms are characterized by the overwhelming activation of normal T lymphocytes and macrophages, invariably leading to clinical and haematologic alterations and death in the absence of treatment.
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level are markedly elevated. In children, a ferritin above 10000 is very sensitive and specific for the diagnosis of HLH, however, the diagnostic utility for ferritin is less for adult HLH patients.
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The first case report of HLH was published in 1939 under the term "Histiocytic Medullary Reticulosis". A second report would come out in 1952 that would rename the disorder that same year.
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only). However, long-term remission without the use of cytotoxic and immune-suppressive therapies is unlikely in the majority of adults with HLH and in those with involvement of the
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Five genetic subtypes (FHL1, FHL2, FHL3, FHL4, and FHL5) are described, with an estimated overall prevalence of one in 50,000 and equal gender distribution. Molecular
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Secondary HLH in some individuals may be self-limited because patients are able to fully recover after having received only supportive medical treatment (i.e., IV
661:(FHL) or familial erythrophagocytic lymphohistiocytosis, is a heterogeneous autosomal recessive disorder found to be more prevalent with parental consanguinity. 2359: 1520:
Daver N, McClain K, Allen CE, Parikh SA, Otrock Z, Rojas-Hernandez C, Blechacz B, Wang S, Minkov M, Jordan MB, La Rosée P, Kantarjian HM (September 2017).
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and haemophagocytic syndrome, with abnormal T-cell and macrophage activation. This type has a grave prognosis if untreated. Type 3 has mutations in
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Fardet, Laurence (September 9, 2014). "Development and Validation of the HScore, a Score for the Diagnosis of Reactive Hemophagocytic Syndrome".
415:) are associated with, and thought to be triggered or promoted by, EBV infection. These cases of HLH are classified as belonging to the class of 1216:
Giang HT, Banno K, Minh LH, Trinh LT, Loc LT, Eltobgy A, Tai LL, Khan A, Tuan NH, Reda Y, Samsom M, Nam NT, Huy NT, Hirayama K (November 2018).
2833: 2745: 2671: 1314:"The syndrome of hemophagocytic lymphohistiocytosis in primary immunodeficiencies: implications for differential diagnosis and pathogenesis" 1463:
Braga Neto, Manuel B.; Badley, Andrew D.; Parikh, Sameer A.; Graham, Rondell P.; Kamath, Patrick S. (2022-02-03). Solomon, Caren G. (ed.).
326: 1995:"Hematopoietic cell transplantation for hemophagocytic lymphohistiocytosis: a journey of a thousand miles begins with a single (big) step" 872:
has collected the published consensus management documents for the many contexts in which HLH occurs and they host full-text versions.
2661: 1839:"Evaluation of the role of secretory sphingomyelinase and bioactive sphingolipids as biomarkers in hemophagocytic lymphohistiocytosis" 210:
Primary HLH is caused by high-penetrance variants in genes associated with the syndrome, and thus is part of the phenotype of several
3445: 2265:"Press Announcements – FDA approves first treatment specifically for patients with rare and life-threatening type of immune disease" 1312:
Speckmann C, Stepensky P, Sykora KW, Tesi B, Vraetz T, Waruiru C, Bryceson YT, Moshous D, Lehmberg K, Jordan MB, Ehl S (July 2015).
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Esteban, Ysabella M.; de Jong, Jill L. O.; Tesher, Melissa S. (1 August 2017). "An Overview of Hemophagocytic Lymphohistiocytosis".
1218:"Dengue hemophagocytic syndrome: A systematic review and meta-analysis on epidemiology, clinical signs, outcomes, and risk factors" 682:
1. A molecular diagnosis consistent with HLH. These include the identification of pathologic mutations of PRF1, UNC13D, or STX11.
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Machowicz R, Janka G, Wiktor-Jedrzejczak W (March 2017). "Similar but not the same: Differential diagnosis of HLH and sepsis".
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Mehta, Puja; McAuley, Daniel F.; Brown, Michael; Sanchez, Emilie; Tattersall, Rachel S.; Manson, Jessica J. (2020-03-28).
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HLH as defined by the HLH-04 criteria (see below) is a descriptive diagnosis. Its individual components are non-specific.
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Clinical Commissioning Policy: Anakinra for Haemophagocytic Lymphohistiocytosis (HLH) for adults and children in all ages
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Clinical Commissioning Policy: Anakinra for Haemophagocytic Lymphohistiocytosis (HLH) for adults and children in all ages
440:. However, symptomatic presentation throughout childhood and even into young adulthood has been observed in some cases. 2943: 2856: 2754: 2798: 2735: 2725: 2682: 930: 861:, one must simultaneously manage both the acute physiologic changes associated with HLH (like systemic inflammation, 500:
Nearly half of the cases of type 2 familial hemophagocytic lymphohistiocytosis are due to bi-allelic PRF1 mutations.
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Allen, Carl (June 2008). "Highly elevated ferritin levels and the diagnosis of hemophagocytic lymphohistiocytosis".
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causes such as bone marrow or other organ transplantations; chemotherapy; or therapy with immunosuppressing agents.
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Zhang, Kejian; Filopovich, Alexandra H.; Johnson, Judith; Marsh, Rebecca A.; Villanueva, Joyce (January 17, 2013).
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seen more often in children than in adults. It is a life-threatening disease of severe hyperinflammation caused by
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A subtype of primary HLH where the inflammation is limited to the central nervous system has been described.
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Wysocki CA (December 2017). "Comparing hemophagocytic lymphohistiocytosis in pediatric and adult patients".
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While optimal treatment of HLH is still being debated, current treatment regimes usually involve high dose
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About 33% of all HLH cases, ~75% of Asian HLH cases, and nearly 100% of HLH cases caused by mutations in
1136:"How can an internal medicine specialist save a patient with hemophagocytic lymphohistiocytosis (HLH)?" 493: 307: 151:. Therefore, HLH should be included in the differential diagnosis of intensive care unit patients with 3401: 3053: 2814: 2656: 369: 211: 200: 39: 3349: 2710: 2695: 2529: 1889: 795: 315: 836:
Three types of Griscelli syndrome are recognised: type 1 has neurologic symptoms and mutations in
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and is characterized by partial albinism. This type does not pose a threat to those so affected.
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Scott, Ronald Bodley; Robb-Smith, A.H.T. (July 22, 1939). "Histiocytic Medullary Reticulosis".
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Decreased blood cell counts affecting at least two of three lineages in the peripheral blood:
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Haemoglobin <9 g/100 ml (in infants <4 weeks: haemoglobin <10 g/100 ml) (
3018: 2758: 2648: 729: 346: 109: 97: 1522:"A consensus review on malignancy-associated hemophagocytic lymphohistiocytosis in adults" 840:. Prognosis depends on the severity of neurologic manifestations. Type 2 has mutations in 8: 2783: 2687: 2498: 858: 760: 223: 215: 774:
In addition, in the case of familial HLH, no evidence of malignancy should be apparent.
732:(fasting, greater than or equal to 265 mg/100 ml) and/or decreased amounts of 298:
to attack EBV-infected cells. Malignant disorders associated with secondary HLH include
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On 20 November 2018, the FDA approved the anti-IFN-gamma monoclonal antibody
646: 530: 518: 514: 295: 2122:"Soluble interleukin-2 receptor is a sensitive diagnostic test in adult HLH" 605:. The liver function tests are usually elevated. A low level of the protein 3127: 3105: 2451: 2433: 2355: 2239: 2204: 2186: 2155: 2098: 2061: 2020: 1979: 1929: 1872: 1823: 1796:"Marked hyperferritinemia does not predict for HLH in the adult population" 1772: 1735: 1694: 1642: 1610: 1557: 1498: 1480: 1449: 1400: 1349: 1289: 1241: 1199: 1161: 1120: 1083:
Machowicz, Rafal; Janka, Gritta; Wiktor-Jedrzejczak, Wieslaw (2016-01-01).
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syndromes. There are inherited and non-inherited (acquired) causes of HLH.
55: 2402: 1431: 3164: 2586: 2011: 1994: 1661:"Human perforin mutations and susceptibility to multiple primary cancers" 1633: 918: 900: 888: 770:(soluble IL-2 receptor) >2400 U/ml (or per local reference laboratory) 746: 721: 570: 2471: 1902:
Ponnatt, Tanya Sajan; Lilley, Cullen M.; Mirza, Kamran M. (2021-08-04).
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Secondary HLH (sHLH) is associated with, and thought to be promoted by,
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Fajgenbaum, David C.; June, Carl H. (2020-12-03). Longo, Dan L. (ed.).
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Rudman Spergel A, Walkovich K, Price S, et al. (November 2013).
2036:"How I treat hemophagocytic lymphohistiocytosis in the adult patient" 1233: 884: 779: 537:. TNF-alpha and TNF-gamma may also lead to inhibition of lipoprotein 526: 522: 152: 3303: 3220: 2875: 1365:"COVID-19: consider cytokine storm syndromes and immunosuppression" 1055:"Familial hemophagocytic lymphohistiocytosis: MedlinePlus Genetics" 926: 739: 621: 546: 462: 443:
The five subtypes of FHL are each associated with a specific gene:
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and non-malignant diseases that likewise weaken the ability of the
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Other conditions that may be confused with this condition include
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In rheumatic diseases, this syndrome is more often referred to as
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Usmani, G. Naheed; Woda, Bruce A.; Newburger, Peter E. (2013).
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Jenkins RW, Clarke CJ, Lucas JT, et al. (November 2013).
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that present with hemophagocytic lymphohistiocytosis, such as
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Attempts to improve diagnosis of HLH have included use of the
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The differential diagnosis of HLH includes secondary HLH and
692: 479: 449: 393: 283: 268: 244: 214:. The most common and best studied causes of Primary HLH are 167: 2168: 1462: 695:(defined as a temperature >100.3 Â°F, >38 Â°C) 3047: 2959: 2889: 1946:"Pediatric CNS-isolated hemophagocytic lymphohistiocytosis" 1626: 1573:"Epstein–Barr Virus and Hemophagocytic Lymphohistiocytosis" 767: 457: 276: 256: 183: 2416:
Farquhar, James W.; Claireaux, Albert E. (December 1952).
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Epstein–Barr virus–associated lymphoproliferative diseases
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Immune disorder in the blood leading to hyperinflammation
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2. Fulfillment of five out of the eight criteria below:
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use to kill targeted cells, such as those infected with
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Patients with HLH, especially when untreated, may need
2461: 1177: 1710:"Advances in understanding the pathogenesis of HLH" 1707: 1215: 679:The current (2008) diagnostic criteria for HLH are 1901: 1836: 1655: 1269:Current Opinion in Allergy and Clinical Immunology 2415: 3432: 1992: 1659:, Thia KY, Andrews M, et al. (April 2013). 1134:Machowicz, Rafal; Basak, Grzegorz (2020-03-05). 985:X-linked lymphoproliferative disease § XLP2 2380: 2253:https://www.histiocytesociety.org/HLH-Consensus 1908:Archives of Pathology & Laboratory Medicine 1173: 1171: 903:have also been used. Other medications include 216:loss of function, (i.e. inactivating) mutations 190:, and elevated ferritin levels (among others). 1413: 1261: 1259: 1133: 2841: 2746:Hereditary progressive mucinous histiocytosis 2672:Congenital self-healing reticulohistiocytosis 2619: 2211: 1629:"Familial Hemophagocytic Lymphohistiocytosis" 736:in the blood (≤ 150 mg/100 ml) 589:—including a decreased number of circulating 1564: 1513: 1168: 659:familial haemophagocytic lymphohistiocytosis 2592:Familial Hemophagocytic Lymphohistiocytosis 2294: 1830: 1649: 1304: 1256: 413:X-linked lymphoproliferative disease type 1 2848: 2834: 2626: 2612: 2162: 1986: 1936: 1622: 1620: 38: 2441: 2194: 2145: 2051: 2010: 1993:Jordan MB, Filipovich AH (October 2008). 1969: 1919: 1888:at the U.S. National Library of Medicine 1862: 1813: 1725: 1684: 1600: 1590: 1547: 1488: 1439: 1390: 1380: 1339: 1211: 1209: 1151: 1110: 1100: 1030: 829:A major differential diagnosis of HLH is 785: 180:yellow discoloration of the skin and eyes 2288: 1006:"Hemophagocytic syndromes and infection" 564: 2220:Critical Reviews in Oncology/Hematology 1617: 1265: 807:autoimmune lymphoproliferative syndrome 3433: 3320:Congenital generalized lipodystrophy 3 2794:Interdigitating dendritic cell sarcoma 2418:"Familial Haemophagocytic Reticulosis" 2329: 2119: 2074: 2033: 1793: 1206: 1003: 933:) to be used in the treatment of HLH. 813:, which may be extremely challenging. 674: 2829: 2607: 2362:from the original on October 18, 2021 1748: 1570: 824: 400:. Secondary HLH may also result from 135: 3292:Hemophagocytic lymphohistiocytosis 4 1904:"Hemophagocytic Lymphohistiocytosis" 1140:Polish Archives of Internal Medicine 800:X-linked lymphoproliferative disease 529:is due to the suppressive effect on 352:Secondary HLH also occurs rarely in 331:adult onset forms of Still's disease 323:macrophage activation syndrome (MAS) 1886:Lymphohistiocytosis,+Hemophagocytic 172:enlargement of the liver and spleen 94:haemophagocytic lymphohistiocytosis 13: 2944:Cranio-lenticulo-sutural dysplasia 2857:Inherited disorders of trafficking 2755:Multicentric reticulohistiocytosis 2701:Hemophagocytic lymphohistiocytosis 730:High blood levels of triglycerides 503: 86:hemophagocytic lymphohistiocytosis 25:Hemophagocytic lymphohistiocytosis 14: 3462: 3334:Limb-girdle muscular dystrophy 2B 2799:Follicular dendritic cell sarcoma 2736:Progressive nodular histiocytosis 2726:Generalized eruptive histiocytoma 2683:non-Langerhans cell histiocytosis 2633: 931:interleukin 1 receptor antagonist 652: 376:); and infections caused by EBV, 128:. It is classified as one of the 3446:Diseases of immune dysregulation 3209:Hereditary spastic paraplegia 10 2991:X-linked intellectual disability 2765:Indeterminate cell histiocytosis 2422:Archives of Disease in Childhood 2232:10.1016/j.critrevonc.2017.03.023 2138:10.1182/bloodadvances.2017012310 1950:Neurol Neuroimmunol Neuroinflamm 1794:Schram, Alison (March 5, 2015). 587:decreased numbers of blood cells 585:The blood count typically shows 545:. Activated macrophages secrete 358:severe combined immunodeficiency 218:in genes that code for proteins 3181:Hereditary spastic paraplegia 4 2662:Hand–SchĂĽller–Christian disease 2409: 2374: 2323: 2277:from the original on 2019-04-23 2257: 2246: 2113: 2068: 2027: 1895: 1879: 1787: 1742: 1701: 1469:New England Journal of Medicine 1456: 1420:New England Journal of Medicine 1407: 1065:from the original on 2021-01-25 212:inborn errors of immunity (IEI) 2120:Hayden, Anna (December 2017). 2034:Schram, Alison (May 7, 2015). 1714:British Journal of Haematology 1356: 1127: 1076: 1047: 997: 792:macrophage-activation syndrome 618:erythrocyte sedimentation rate 325:and occurs most frequently in 166:HLH clinically manifests with 1: 3441:Autosomal recessive disorders 2721:Benign cephalic histiocytosis 2644:Langerhans cell histiocytosis 2395:10.1016/S0140-6736(00)61951-7 2330:Parikh, Sameer (April 2014). 1382:10.1016/S0140-6736(20)30628-0 990: 631:level is usually low and the 339:juvenile idiopathic arthritis 124:that secrete high amounts of 3421:vesicular transport proteins 2861:vesicular transport proteins 2348:10.1016/j.mayocp.2013.12.012 2295:NHS England (October 2021). 2270:Food and Drug Administration 2078:Arthritis & Rheumatology 2053:10.1182/blood-2015-01-551622 1962:10.1212/NXI.0000000000000560 1815:10.1182/blood-2014-10-602607 1752:Pediatric Blood & Cancer 1332:10.3324/haematol.2014.121608 1282:10.1097/ACI.0000000000000405 1192:10.3928/19382359-20170717-01 953:(brain and/or spinal cord). 936: 851: 560: 335:systemic lupus erythematosus 7: 3005:Hermansky–Pudlak syndrome 2 973: 964: 657:Primary HLH, also known as 601:. The bone marrow may show 569:Light microscopic image of 426: 10: 3467: 956: 796:primary immunodeficiencies 494:Syntaxin binding protein 2 354:immunodeficiency disorders 308:acute lymphocytic leukemia 114:uncontrolled proliferation 3416: 3402:Distal muscular dystrophy 3390: 3348: 3302: 3260: 3251: 3219: 3191: 3163: 3135: 3126: 3086: 3064: 3042: 3033: 2976: 2954: 2926: 2902:Hermansky–Pudlak syndrome 2874: 2867: 2807: 2773: 2680: 2641: 2566: 2465: 1921:10.5858/arpa.2020-0802-RA 1102:10.1186/s13054-016-1369-3 1004:Fisman, David N. (2000). 905:cytokine targeted therapy 745:Haemophagocytosis in the 699:Enlargement of the spleen 645:Bone marrow biopsy shows 201:cytokine release syndrome 193: 62: 46: 37: 29: 24: 3350:Vacuolar protein sorting 3237:Spinocerebellar ataxia 5 2916:ChĂ©diak–Higashi syndrome 2696:Juvenile xanthogranuloma 1890:Medical Subject Headings 1592:10.3389/fimmu.2017.01902 929:(a modified recombinant 720:Neutrophils <1Ă—10/L ( 713:Platelets <100Ă—10/L ( 609:in the blood is common. 366:Wiskott–Aldrich syndrome 316:myelodysplastic syndrome 106:haemophagocytic syndrome 2789:Langerhans cell sarcoma 2776:malignant histiocytosis 2706:Erdheim-Chester disease 2336:Mayo Clinic Proceedings 1578:Frontiers in Immunology 1465:"Calm before the Storm" 2716:Sea-blue histiocytosis 2667:Eosinophilic granuloma 2434:10.1136/adc.27.136.519 2187:10.1542/peds.2012-2748 1999:Bone Marrow Transplant 1481:10.1056/NEJMcps2111163 1023:10.3201/eid0606.000608 951:central nervous system 786:Differential diagnosis 582: 543:triglyceride synthesis 374:dyskeratosis congenita 337:. It occurs rarely in 312:acute myeloid leukemia 126:inflammatory cytokines 2815:Rosai–Dorfman disease 2751:Reticulohistiocytosis 2731:Xanthoma disseminatum 2657:Letterer–Siwe disease 1432:10.1056/NEJMra2026131 1011:Emerging Infect. Dis. 568: 551:plasminogen activator 370:ataxia–telangiectasia 3153:Griscelli syndrome 1 3112:Griscelli syndrome 3 3076:Griscelli syndrome 2 2759:Reticulohistiocytoma 2711:Niemann–Pick disease 2649:X-type histiocytosis 2012:10.1038/bmt.2008.232 577:containing numerous 347:rheumatoid arthritis 176:enlarged lymph nodes 110:hematologic disorder 54:within macrophages. 2784:Histiocytic sarcoma 2688:Non-X histiocytosis 1153:10.20452/pamw.15226 761:natural killer cell 675:Diagnostic criteria 635:level is elevated. 3338:Long QT syndrome 9 2567:External resources 2311:on 13 October 2021 1677:10.4161/onci.24185 1540:10.1002/cncr.30826 870:Histiocyte Society 868:The International 831:Griscelli syndrome 825:Griscelli syndrome 614:C reactive protein 583: 581:in their cytoplasm 327:the juvenile onset 232:Epstein-Barr virus 136:Signs and symptoms 3428: 3427: 3412: 3411: 3247: 3246: 3122: 3121: 3029: 3028: 2868:Vesicle formation 2823: 2822: 2601: 2600: 2091:10.1002/art.38690 1855:10.1002/ajh.23535 1765:10.1002/pbc.21423 1727:10.1111/bjh.12293 1571:Marsh RA (2017). 1375:(10229): 1033–4. 595:white blood cells 555:hyperfibrinolysis 533:by TNF-alpha and 362:DiGeorge syndrome 220:cytotoxic T cells 205:CART cell therapy 161:internal medicine 157:hyperferritinemia 149:intensive therapy 108:, is an uncommon 92:), also known as 78: 77: 19:Medical condition 3458: 3262:Synaptic vesicle 3258: 3257: 3133: 3132: 3040: 3039: 2872: 2871: 2850: 2843: 2836: 2827: 2826: 2741:Papular xanthoma 2628: 2621: 2614: 2605: 2604: 2463: 2462: 2456: 2455: 2445: 2428:(136): 519–525. 2413: 2407: 2406: 2378: 2372: 2371: 2369: 2367: 2327: 2321: 2320: 2318: 2316: 2310: 2304:. Archived from 2303: 2292: 2286: 2285: 2283: 2282: 2261: 2255: 2250: 2244: 2243: 2215: 2209: 2208: 2198: 2166: 2160: 2159: 2149: 2117: 2111: 2110: 2072: 2066: 2065: 2055: 2031: 2025: 2024: 2014: 1990: 1984: 1983: 1973: 1940: 1934: 1933: 1923: 1899: 1893: 1883: 1877: 1876: 1866: 1834: 1828: 1827: 1817: 1791: 1785: 1784: 1746: 1740: 1739: 1729: 1705: 1699: 1698: 1688: 1653: 1647: 1646: 1624: 1615: 1614: 1604: 1594: 1568: 1562: 1561: 1551: 1517: 1511: 1510: 1492: 1460: 1454: 1453: 1443: 1416:"Cytokine Storm" 1411: 1405: 1404: 1394: 1384: 1360: 1354: 1353: 1343: 1308: 1302: 1301: 1263: 1254: 1253: 1234:10.1002/rmv.2005 1213: 1204: 1203: 1180:Pediatric Annals 1175: 1166: 1165: 1155: 1131: 1125: 1124: 1114: 1104: 1080: 1074: 1073: 1071: 1070: 1051: 1045: 1044: 1034: 1001: 917:In October 2021 742:≥ 500 ng/ml 715:thrombocytopenia 640:sphingomyelinase 603:hemophagocytosis 573:showing stromal 343:Kawasaki disease 203:associated with 98:British spelling 42: 22: 21: 3466: 3465: 3461: 3460: 3459: 3457: 3456: 3455: 3431: 3430: 3429: 3424: 3408: 3386: 3344: 3298: 3278:CEDNIK syndrome 3243: 3215: 3187: 3159: 3118: 3082: 3060: 3025: 2972: 2950: 2922: 2863: 2854: 2824: 2819: 2803: 2769: 2686: 2676: 2647: 2637: 2632: 2602: 2597: 2596: 2562: 2561: 2474: 2460: 2459: 2414: 2410: 2389:(6047): 194–8. 2379: 2375: 2365: 2363: 2328: 2324: 2314: 2312: 2308: 2301: 2293: 2289: 2280: 2278: 2263: 2262: 2258: 2251: 2247: 2216: 2212: 2167: 2163: 2132:(26): 2529–34. 2118: 2114: 2073: 2069: 2046:(19): 2908–14. 2032: 2028: 1991: 1987: 1941: 1937: 1900: 1896: 1884: 1880: 1849:(11): E265–72. 1835: 1831: 1808:(10): 1548–52. 1792: 1788: 1747: 1743: 1706: 1702: 1654: 1650: 1625: 1618: 1569: 1565: 1534:(17): 3229–40. 1518: 1514: 1461: 1457: 1426:(23): 2255–73. 1412: 1408: 1361: 1357: 1309: 1305: 1264: 1257: 1214: 1207: 1176: 1169: 1132: 1128: 1081: 1077: 1068: 1066: 1059:medlineplus.gov 1053: 1052: 1048: 1002: 998: 993: 976: 967: 959: 939: 881:corticosteroids 854: 827: 788: 677: 655: 591:red blood cells 579:red blood cells 563: 506: 504:Pathophysiology 433:genetic testing 429: 378:cytomegalovirus 304:B-cell lymphoma 300:T-cell lymphoma 196: 138: 52:red blood cells 20: 17: 12: 11: 5: 3464: 3454: 3453: 3448: 3443: 3426: 3425: 3417: 3414: 3413: 3410: 3409: 3407: 3406: 3405: 3404: 3391: 3388: 3387: 3385: 3384: 3383: 3382: 3380:Cohen syndrome 3370: 3369: 3368: 3355: 3353: 3346: 3345: 3343: 3342: 3341: 3340: 3324: 3323: 3322: 3309: 3307: 3300: 3299: 3297: 3296: 3295: 3294: 3282: 3281: 3280: 3267: 3265: 3255: 3253:Vesicle fusion 3249: 3248: 3245: 3244: 3242: 3241: 3240: 3239: 3226: 3224: 3217: 3216: 3214: 3213: 3212: 3211: 3198: 3196: 3189: 3188: 3186: 3185: 3184: 3183: 3170: 3168: 3161: 3160: 3158: 3157: 3156: 3155: 3142: 3140: 3130: 3124: 3123: 3120: 3119: 3117: 3116: 3115: 3114: 3102: 3101: 3100: 3087: 3084: 3083: 3081: 3080: 3079: 3078: 3065: 3062: 3061: 3059: 3058: 3057: 3056: 3043: 3037: 3031: 3030: 3027: 3026: 3024: 3023: 3022: 3021: 3009: 3008: 3007: 2995: 2994: 2993: 2980: 2978: 2974: 2973: 2971: 2970: 2969: 2968: 2955: 2952: 2951: 2949: 2948: 2947: 2946: 2933: 2931: 2924: 2923: 2921: 2920: 2919: 2918: 2906: 2905: 2904: 2885: 2883: 2869: 2865: 2864: 2853: 2852: 2845: 2838: 2830: 2821: 2820: 2818: 2817: 2811: 2809: 2805: 2804: 2802: 2801: 2796: 2791: 2786: 2780: 2778: 2771: 2770: 2768: 2767: 2762: 2748: 2743: 2738: 2733: 2728: 2723: 2718: 2713: 2708: 2703: 2698: 2692: 2690: 2678: 2677: 2675: 2674: 2669: 2664: 2659: 2653: 2651: 2639: 2638: 2631: 2630: 2623: 2616: 2608: 2599: 2598: 2595: 2594: 2583: 2571: 2570: 2568: 2564: 2563: 2560: 2559: 2548: 2537: 2526: 2506: 2491: 2475: 2470: 2469: 2467: 2466:Classification 2458: 2457: 2408: 2373: 2342:(4): 484–492. 2322: 2287: 2273:. 2019-03-06. 2256: 2245: 2210: 2181:(5): e1440–4. 2161: 2126:Blood Advances 2112: 2085:(9): 2613–20. 2067: 2026: 1985: 1935: 1914:(4): 507–519. 1894: 1878: 1843:Am. J. Hematol 1829: 1786: 1759:(6): 1227–35. 1741: 1720:(5): 609–622. 1700: 1665:Oncoimmunology 1648: 1616: 1563: 1512: 1475:(5): 479–485. 1455: 1406: 1355: 1303: 1276:(6): 405–413. 1255: 1205: 1186:(8): e309–13. 1167: 1126: 1075: 1046: 995: 994: 992: 989: 988: 987: 982: 975: 972: 966: 963: 958: 955: 947:immunoglobulin 938: 935: 895:is also used. 893:immunoglobulin 891:. Intravenous 853: 850: 826: 823: 787: 784: 772: 771: 764: 759:Low or absent 757: 743: 737: 727: 726: 725: 718: 711: 701: 696: 676: 673: 654: 653:Classification 651: 562: 559: 505: 502: 498: 497: 484: 475: 466: 453: 428: 425: 195: 192: 137: 134: 130:cytokine storm 102:hemophagocytic 76: 75: 66: 60: 59: 44: 43: 35: 34: 31: 27: 26: 18: 15: 9: 6: 4: 3: 2: 3463: 3452: 3451:Histiocytosis 3449: 3447: 3444: 3442: 3439: 3438: 3436: 3423: 3422: 3415: 3403: 3400: 3399: 3398: 3397: 3393: 3392: 3389: 3381: 3378: 3377: 3376: 3375: 3371: 3367: 3364: 3363: 3362: 3361: 3357: 3356: 3354: 3351: 3347: 3339: 3335: 3332: 3331: 3330: 3329: 3325: 3321: 3318: 3317: 3316: 3315: 3311: 3310: 3308: 3305: 3301: 3293: 3290: 3289: 3288: 3287: 3283: 3279: 3276: 3275: 3274: 3273: 3269: 3268: 3266: 3263: 3259: 3256: 3254: 3250: 3238: 3235: 3234: 3233: 3232: 3228: 3227: 3225: 3222: 3218: 3210: 3207: 3206: 3205: 3204: 3200: 3199: 3197: 3194: 3190: 3182: 3179: 3178: 3177: 3176: 3172: 3171: 3169: 3166: 3162: 3154: 3151: 3150: 3149: 3148: 3144: 3143: 3141: 3138: 3134: 3131: 3129: 3125: 3113: 3110: 3109: 3108: 3107: 3103: 3099: 3098:Choroideremia 3096: 3095: 3094: 3093: 3089: 3088: 3085: 3077: 3074: 3073: 3072: 3071: 3067: 3066: 3063: 3055: 3052: 3051: 3050: 3049: 3045: 3044: 3041: 3038: 3036: 3032: 3020: 3017: 3016: 3015: 3014: 3010: 3006: 3003: 3002: 3001: 3000: 2996: 2992: 2989: 2988: 2987: 2986: 2982: 2981: 2979: 2975: 2967: 2964: 2963: 2962: 2961: 2957: 2956: 2953: 2945: 2942: 2941: 2940: 2939: 2935: 2934: 2932: 2929: 2925: 2917: 2914: 2913: 2912: 2911: 2907: 2903: 2900: 2899: 2898: 2897: 2892: 2891: 2887: 2886: 2884: 2881: 2877: 2873: 2870: 2866: 2862: 2858: 2851: 2846: 2844: 2839: 2837: 2832: 2831: 2828: 2816: 2813: 2812: 2810: 2806: 2800: 2797: 2795: 2792: 2790: 2787: 2785: 2782: 2781: 2779: 2777: 2772: 2766: 2763: 2760: 2756: 2752: 2749: 2747: 2744: 2742: 2739: 2737: 2734: 2732: 2729: 2727: 2724: 2722: 2719: 2717: 2714: 2712: 2709: 2707: 2704: 2702: 2699: 2697: 2694: 2693: 2691: 2689: 2684: 2679: 2673: 2670: 2668: 2665: 2663: 2660: 2658: 2655: 2654: 2652: 2650: 2645: 2640: 2636: 2635:Histiocytosis 2629: 2624: 2622: 2617: 2615: 2610: 2609: 2606: 2593: 2589: 2588: 2584: 2582: 2578: 2577: 2573: 2572: 2569: 2565: 2558: 2554: 2553: 2549: 2547: 2543: 2542: 2538: 2536: 2532: 2531: 2527: 2525: 2522: 2519: 2516: 2512: 2511: 2507: 2505: 2501: 2500: 2496: 2492: 2490: 2486: 2485: 2481: 2477: 2476: 2473: 2468: 2464: 2453: 2449: 2444: 2439: 2435: 2431: 2427: 2423: 2419: 2412: 2404: 2400: 2396: 2392: 2388: 2384: 2377: 2361: 2357: 2353: 2349: 2345: 2341: 2337: 2333: 2326: 2307: 2300: 2299: 2291: 2276: 2272: 2271: 2266: 2260: 2254: 2249: 2241: 2237: 2233: 2229: 2225: 2221: 2214: 2206: 2202: 2197: 2192: 2188: 2184: 2180: 2176: 2172: 2165: 2157: 2153: 2148: 2143: 2139: 2135: 2131: 2127: 2123: 2116: 2108: 2104: 2100: 2096: 2092: 2088: 2084: 2080: 2079: 2071: 2063: 2059: 2054: 2049: 2045: 2041: 2037: 2030: 2022: 2018: 2013: 2008: 2004: 2000: 1996: 1989: 1981: 1977: 1972: 1967: 1963: 1959: 1955: 1951: 1947: 1939: 1931: 1927: 1922: 1917: 1913: 1909: 1905: 1898: 1891: 1887: 1882: 1874: 1870: 1865: 1860: 1856: 1852: 1848: 1844: 1840: 1833: 1825: 1821: 1816: 1811: 1807: 1803: 1802: 1797: 1790: 1782: 1778: 1774: 1770: 1766: 1762: 1758: 1754: 1753: 1745: 1737: 1733: 1728: 1723: 1719: 1715: 1711: 1704: 1696: 1692: 1687: 1682: 1678: 1674: 1671:(4): e24185. 1670: 1666: 1662: 1658: 1652: 1644: 1640: 1636: 1635: 1630: 1623: 1621: 1612: 1608: 1603: 1598: 1593: 1588: 1584: 1580: 1579: 1574: 1567: 1559: 1555: 1550: 1545: 1541: 1537: 1533: 1529: 1528: 1523: 1516: 1508: 1504: 1500: 1496: 1491: 1486: 1482: 1478: 1474: 1470: 1466: 1459: 1451: 1447: 1442: 1437: 1433: 1429: 1425: 1421: 1417: 1410: 1402: 1398: 1393: 1388: 1383: 1378: 1374: 1370: 1366: 1359: 1351: 1347: 1342: 1337: 1333: 1329: 1326:(7): 978–88. 1325: 1321: 1320: 1319:Haematologica 1315: 1307: 1299: 1295: 1291: 1287: 1283: 1279: 1275: 1271: 1270: 1262: 1260: 1251: 1247: 1243: 1239: 1235: 1231: 1227: 1223: 1222:Rev Med Virol 1219: 1212: 1210: 1201: 1197: 1193: 1189: 1185: 1181: 1174: 1172: 1163: 1159: 1154: 1149: 1145: 1141: 1137: 1130: 1122: 1118: 1113: 1108: 1103: 1098: 1094: 1090: 1089:Critical Care 1086: 1079: 1064: 1060: 1056: 1050: 1042: 1038: 1033: 1028: 1024: 1020: 1016: 1013: 1012: 1007: 1000: 996: 986: 983: 981: 980:Emperipolesis 978: 977: 971: 962: 954: 952: 948: 943: 934: 932: 928: 924: 920: 915: 913: 908: 906: 902: 898: 894: 890: 886: 882: 877: 873: 871: 866: 864: 860: 849: 847: 843: 839: 834: 832: 822: 820: 814: 812: 808: 803: 801: 797: 793: 783: 781: 775: 769: 765: 762: 758: 756: 752: 748: 744: 741: 738: 735: 731: 728: 723: 719: 716: 712: 709: 705: 704: 702: 700: 697: 694: 691: 690: 689: 686: 683: 680: 672: 669: 666: 662: 660: 650: 648: 647:histiocytosis 643: 642:is elevated. 641: 636: 634: 630: 625: 623: 619: 615: 610: 608: 604: 600: 596: 592: 588: 580: 576: 572: 567: 558: 556: 552: 548: 544: 541:or stimulate 540: 536: 532: 531:hematopoiesis 528: 524: 520: 516: 512: 501: 495: 491: 490: 485: 483:(Syntaxin 11) 482: 481: 476: 473: 472: 467: 464: 460: 459: 454: 452: 451: 446: 445: 444: 441: 439: 434: 424: 422: 418: 414: 410: 405: 403: 399: 395: 391: 387: 383: 379: 375: 371: 367: 363: 359: 355: 350: 348: 344: 340: 336: 332: 328: 324: 319: 317: 313: 309: 305: 301: 297: 296:immune system 293: 288: 286: 285: 280: 278: 274: 270: 266: 262: 258: 254: 250: 246: 242: 237: 234:(EBV) or the 233: 229: 225: 221: 217: 213: 208: 206: 202: 191: 189: 188:transaminitis 185: 181: 177: 173: 169: 164: 162: 158: 154: 150: 145: 141: 133: 131: 127: 123: 119: 115: 111: 107: 103: 99: 95: 91: 87: 83: 74: 70: 67: 65: 61: 57: 56:H&E stain 53: 49: 45: 41: 36: 32: 28: 23: 3418: 3394: 3372: 3366:ARC syndrome 3358: 3326: 3312: 3291: 3284: 3270: 3229: 3201: 3173: 3145: 3128:Cytoskeleton 3104: 3090: 3068: 3046: 3011: 2997: 2983: 2958: 2936: 2908: 2894: 2888: 2700: 2585: 2574: 2550: 2539: 2528: 2508: 2493: 2478: 2425: 2421: 2411: 2386: 2382: 2376: 2366:December 14, 2364:. Retrieved 2339: 2335: 2325: 2313:. Retrieved 2306:the original 2297: 2290: 2279:. Retrieved 2268: 2259: 2248: 2223: 2219: 2213: 2178: 2174: 2164: 2129: 2125: 2115: 2082: 2076: 2070: 2043: 2039: 2029: 2005:(7): 433–7. 2002: 1998: 1988: 1953: 1949: 1938: 1911: 1907: 1897: 1881: 1846: 1842: 1832: 1805: 1799: 1789: 1756: 1750: 1744: 1717: 1713: 1703: 1668: 1664: 1651: 1632: 1582: 1576: 1566: 1531: 1525: 1515: 1472: 1468: 1458: 1423: 1419: 1409: 1372: 1368: 1358: 1323: 1317: 1306: 1273: 1267: 1228:(6): e2005. 1225: 1221: 1183: 1179: 1146:(5): 431–7. 1143: 1139: 1129: 1092: 1088: 1078: 1067:. Retrieved 1058: 1049: 1017:(6): 601–8. 1014: 1009: 999: 968: 960: 944: 940: 922: 916: 909: 897:Methotrexate 878: 874: 867: 855: 846:melanophilin 835: 828: 815: 804: 789: 776: 773: 687: 684: 681: 678: 670: 667: 663: 658: 656: 644: 637: 626: 611: 584: 507: 499: 487: 478: 469: 456: 448: 442: 437: 430: 408: 406: 351: 320: 289: 282: 239: 236:Dengue virus 209: 197: 165: 146: 142: 139: 105: 101: 93: 89: 85: 79: 3165:Microtubule 2587:GeneReviews 1956:(3): e560. 1634:GeneReviews 925:, allowing 919:NHS England 901:vincristine 889:cyclosporin 755:lymph nodes 747:bone marrow 722:neutropenia 575:macrophages 571:bone marrow 553:leading to 419:and termed 341:, juvenile 122:macrophages 118:lymphocytes 30:Other names 3435:Categories 2880:Melanosome 2541:DiseasesDB 2383:The Lancet 2315:14 October 2281:2018-11-20 2175:Pediatrics 1657:Trapani JA 1645:. NBK1444. 1369:The Lancet 1095:(1): 215. 1069:2021-01-24 991:References 921:published 912:emapalumab 821:activity. 734:fibrinogen 629:fibrinogen 627:The serum 612:The serum 474:(Munc13-4) 402:iatrogenic 398:SARS-CoV-2 116:of benign 82:hematology 73:immunology 69:Hematology 48:Micrograph 3419:See also 2808:Ungrouped 2576:eMedicine 2557:234437005 2552:SNOMED CT 1507:246488008 937:Prognosis 885:etoposide 852:Treatment 794:or other 599:platelets 561:Diagnosis 535:TNF-gamma 527:cytopenia 523:TNF-alpha 496:)/UNC18-2 292:malignant 230:like the 228:pathogens 153:cytopenia 64:Specialty 3304:Caveolae 3221:Spectrin 2966:CDOG IIE 2876:Lysosome 2774:WHO-III/ 2452:13008468 2360:Archived 2356:24581757 2275:Archived 2240:28477737 2226:: 1–12. 2205:24101757 2156:29296904 2107:43419202 2099:24782338 2062:25758828 2021:18679369 1980:31044148 1930:34347856 1873:23828274 1824:25573993 1781:25546028 1773:18085676 1736:23577835 1695:23734337 1643:20301617 1611:29358936 1585:: 1902. 1558:28621800 1499:35108473 1450:33264547 1401:32192578 1350:26022711 1298:11439142 1290:28957822 1250:52002485 1242:30109914 1200:28806468 1162:32134401 1121:27389585 1063:Archived 1041:11076718 974:See also 965:Research 927:Anakinra 766:Soluble 763:activity 740:Ferritin 622:ferritin 547:ferritin 463:Perforin 438:in utero 427:Genetics 421:EBV+ HLH 390:protozoa 386:bacteria 382:HIV/AIDS 356:such as 224:NK cells 182:, and a 50:showing 3193:Kinesin 2681:WHO-II/ 2581:ped/745 2535:D051359 2443:1988563 2403:6131175 2196:3813387 2147:5728644 1971:6467688 1864:4348111 1686:3654607 1602:5766650 1549:5568927 1490:8830531 1441:7727315 1392:7270045 1341:4486233 1112:4937543 1032:2640913 957:History 819:NK cell 633:D-dimer 607:albumin 511:granule 333:and in 163:wards. 100:), and 3374:VPS13B 3360:VPS33B 3272:SNAP29 3231:SPTBN2 3137:Myosin 3070:RAB27A 2938:SEC23A 2642:WHO-I/ 2524:603552 2521:608898 2518:603553 2515:267700 2450:  2440:  2401:  2354:  2238:  2203:  2193:  2154:  2144:  2105:  2097:  2060:  2019:  1978:  1968:  1928:  1892:(MeSH) 1871:  1861:  1822:  1779:  1771:  1734:  1693:  1683:  1641:  1609:  1599:  1556:  1546:  1527:Cancer 1505:  1497:  1487:  1448:  1438:  1399:  1389:  1348:  1338:  1296:  1288:  1248:  1240:  1198:  1160:  1119:  1109:  1039:  1029:  842:RAB27A 811:sepsis 780:HScore 751:spleen 708:anemia 620:, and 597:, and 539:lipase 525:; 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Index


Micrograph
red blood cells
H&E stain
Specialty
Hematology
immunology
hematology
British spelling
hematologic disorder
uncontrolled proliferation
lymphocytes
macrophages
inflammatory cytokines
cytokine storm
intensive therapy
cytopenia
hyperferritinemia
internal medicine
fever
enlargement of the liver and spleen
enlarged lymph nodes
yellow discoloration of the skin and eyes
rash
transaminitis
cytokine release syndrome
CART cell therapy
inborn errors of immunity (IEI)
loss of function, (i.e. inactivating) mutations
cytotoxic T cells

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