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Neurofibroma

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Dermal neurofibromas typically arise in the teenage years and are often associated with the onset of puberty. In people with neurofibromatosis type I, they tend to continue to increase in number and size throughout adulthood, although limits exist as to how big they get, and cases progress at highly
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A large plexiform neurofibroma in the leg of a 6-year-old male. The authors state: "Our case was operated, as both the cutaneous and deep branches of the peroneal nerve were involved causing pain and numbness in the leg, and because there was a possibility for malignant transformation, as growth in
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While nonmyelinating Schwann cells are the origin of neurofibromas, the mutations that make them susceptible to this transformation occur in Schwann cell precursors during early nerve development. Mutated nonmyelinating Schwann cells do not form normal Remak bundles. Instead, they fail to properly
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Neurofibromas have been subdivided into two broad categories: dermal and plexiform. Dermal neurofibromas are associated with a single peripheral nerve, while plexiform neurofibromas are associated with multiple nerve bundles. According to the World Health Organization classification system, dermal
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have been proposed as a novel treatment of neurofibromas. ACE inhibitors are currently used to treat hypertension and congestive heart failure, to avert remodeling and reinfarction after myocardial infarction, and to ameliorate diabetic nephropathy and other renal diseases. ACE inhibitors work by
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can be used as treatment. However, radiation is generally not used as a treatment for plexiform neurofibromas because of concerns that this could actually promote malignant transformation. There has even been a documented case of a Schwannoma being induced from a neurofibroma due to radiation
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or from more internal nerve bundles, and can be very large (with mass in the tens of kilograms). Internal plexiform neurofibromas are very difficult to remove completely because they extend through multiple layers of tissue and the attempt would damage healthy tissue or organs.
129:, another type of tumor arising from Schwann cells, neurofibromas incorporate many additional types of cells and structural elements in addition to Schwann cells, making it difficult to identify and understand all the mechanisms through which they originate and develop. 370:, or GTPase-activating protein. GAP accelerates the conversion of the active GTP-bound RAS to its inactive GDP-bound form, inactivating RAS and reducing RAS-mediated growth signaling. Loss of RAS control leads to increased activity of other signaling pathways including 715:
which inhibits the Ras kinase in a post translational modification step before the kinase pathway becomes hyperactive. It successfully passed phase one clinical trials but was suspended (NCT00029354) in phase two after showing no improvement over controls.
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Dermal neurofibromas may be 2 to 20 mm in diameter, is soft, flaccid, and pinkish-white, and frequently this soft small tumor can be invaginated, as if through a ring in the skin by pressure with the finger, a maneuver called "button-holing".
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Mautner VF, Friedrich RE, von Deimling A, Hagel C, Korf B, Knöfel MT, et al. (September 2003). "Malignant peripheral nerve sheath tumours in neurofibromatosis type 1: MRI supports the diagnosis of malignant plexiform neurofibroma".
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Ostertag et al. said this about treatment by laser: "The cosmetic disfigurement is the most important issue in the decision to treat cutaneous symptoms of neurofibromatosis. Treating patients with extensive neurofibromas with
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gene represents the ultimate solution to preventing the cluster of maladies which are enabled by the mutation. As of 2006, therapy for NF1 tumors had not been tested due to the lack of an appropriate NF1 tumor model.
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McCarron KF, Goldblum JR. Plexiform neurofibroma with and without associated malignant peripheral nerve sheath tumor: a clinicopathologic and immunohistochemical analysis of 54 cases. Mod Pathol. 1998; 11:612–617.
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surround and segregate target axons. It is unknown at this time why, if both types of Schwann cells exhibit bilallelic inactivation of the NF1 gene, only the nonmyelinating variety give rise to neurofibromas.
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laser is still the best choice. However, it is strongly advised that a test treatment be performed to judge the effectiveness of the procedure and whether the developed scar is an acceptable trade-off."
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Removal of plexiform neurofibromas is difficult because they can be large and cross tissue boundaries. However, besides pain, plexiform neurofibromas are sometimes removed due to the possibility of
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the mass was realized by the family members of the patient." The authors also note, "However, complete resection is quite difficult due to invasion of the tumor into the surrounding soft tissues."
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The many drug therapies under study for neurofibromas are in various stages of research; more time will be required to determine if these are viable options for the treatment of neurofibromas.
991:"Cardiac overload resolved by resection of a large plexiform neurofibroma on both the buttocks and upper posterior thighs in a patient with neurofibromatosis type I: a case report" 2469: 283:. Plexiform neurofibroma is a known precursor for MPNST in NF1 patients. The formation of malignant cancers from neurofibromas is associated with the loss of expression of the 4026: 390:. This increased activity of downstream RAS pathways might work together to increase cell growth and survival. Genes that code for proteins that regulate cell growth, such as 2297: 593:
Dermal neurofibromas are not usually surgically removed unless they are painful or disfiguring, because there are generally so many of them and they are not dangerous.
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Packer RJ, Gutmann DH, Rubenstein A, Viskochil D, Zimmerman RA, Vezina G, et al. (May 2002). "Plexiform neurofibromas in NF1: toward biologic-based therapy".
406:. Neurofibromin has other growth-regulatory properties besides its ability to regulate RAS activity, but these other functions are poorly understood at this time. 1550:
Cebesoy O, Tutar E, Isik M, Arpacioglu O (October 2007). "A case of isolated giant plexiform neurofibroma involving all branches of the common peroneal nerve".
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that is composed of 2,818 amino acids with three alternatively spliced exons (9a, 23a and 48a) in the encoding gene. The functional part of neurofibromin is a
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tumors. Plexiform neurofibroma are more difficult to treat and can transform into malignant tumors. Dermal neurofibroma do not become malignant.
2969: 426:, nonmyelinating Schwann cells encapsulate small diameter PNS axons with their cytoplasmic processes. Nonmyelinating Schwann cells are the 2054:
for "Sorafenib in Treating Young Patients With Neurofibromatosis Type 1 and Plexiform Neurofibromas That Cannot Be Removed by Surgery" at
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Once a nonmyelinating Schwann cell has suffered inactivation of its NF1 genes, it begins to proliferate rapidly. This condition is called
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for "A Phase II Study of the mTOR Inhibitor Sirolimus in Neurofibromatosis Type 1 Related Plexiform Neurofibromas (Protocol 102)" at
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for the NF1 gene must be recruited to the site. It has been hypothesized that the proliferating nonmyelinating Schwann cells secrete
1961:"Phase II Study of Gleevec/Imatinib Mesylate (STI-571, NSC 716051) in Neurofibromatosis (NF1) Patients with Plexiform Neurofibromas" 4066: 2167:"Tranilast, an anti-allergic drug, down-regulates the growth of cultured neurofibroma cells derived from neurofibromatosis type 1" 4010: 3934: 3858: 800: 493:. These chemicals promote the migration of different kinds of cells that are heterozygous for the NF1 gene into the hyperplastic 280: 1963: 3276: 375: 2301: 1366: 877: 2411: 3696: 3550: 3058: 641:
The following examples show that plexiform neurofibromas can form anywhere and can make surgical resection difficult:
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that only express the inactive version of the NF1 gene, which leads to a complete loss of expression of functional
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Dermal and plexiform neurofibromas differ in later development stages, but the details are unclear at this point.
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Plexiform neurofibromas have the potential to cause severe clinical complications if they occur in certain areas.
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Isler MH, Fogaça MF, Mankin HJ (April 1996). "Radiation induced malignant schwannoma arising in a neurofibroma".
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for "Tarceva/Rapamycin for Children With Low-Grade Gliomas With or Without Neurofibromatosis Type 1 (NF1)" at
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Rubin JB, Gutmann DH (July 2005). "Neurofibromatosis type 1 - a model for nervous system tumour formation?".
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Note: Not all brain tumors are of nervous tissue, and not all nervous tissue tumors are in the brain (see
418:, myelinating and nonmyelinating. While myelinating Schwann cells cover large diameter (>1 micrometer) 3137: 2668: 2623: 1818: 3490: 3210: 95:. They can result in a range of symptoms from physical disfiguration and pain to cognitive disability. 89: 3948: 3412: 1261:"Induction of abnormal proliferation by nonmyelinating schwann cells triggers neurofibroma formation" 660:
A 14-year-old girl with NF1 was diagnosed with a neurofibroma involving her bladder, a rare location.
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Meesa IR, Junewick JJ (August 2008). "Pelvic plexiform neurofibroma involving the urinary bladder".
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element in neurofibromas. This conglomeration of nonmyelinating Schwann cells and axons is called a
170:: Sessile or pedunculated masses on the skin, which are fleshy and non-tender, and can vary in size. 3787: 3782: 3574: 3255: 2901: 2838: 2733: 2366: 1793: 1460:"Hypertrophic scars after therapy with CO2 laser for treatment of multiple cutaneous neurofibromas" 635: 216: 85: 40: 1945:"Gleevec Holds Potential As First Drug To Successfully Treat Neurofibromatosis, Scientists Report" 1041: 3566: 3520: 3215: 2934: 2906: 2536: 1944: 1781:"R115777 to Treat Children With Neurofibromatosis Type 1 and Progressive Plexiform Neurofibromas" 989:
Mikami T, Honma-Koretsune Y, Tsunoda Y, Kagimoto S, Yabuki Y, Maegawa J, et al. (May 2020).
978:. Honolulu, HI: Department of Pediatrics, University of Hawaii, John A. Burns School of Medicine. 2032: 971: 4061: 3706: 3701: 3635: 3495: 3407: 2723: 2257:"Neurofibromatosis Type 1 and tumorigenesis: molecular mechanisms and therapeutic implications" 455: 403: 1847:
for "Sirolimus to Treat Plexiform Neurofibromas in Patients With Neurofibromatosis Type I" at
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Kolanczyk M, Mautner V, Kossler N, Nguyen R, KĂĽhnisch J, Zemojtel T, et al. (July 2011).
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Early research has shown potential for using the c-kit tyrosine kinase blocking properties of
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Wu J, Dombi E, Jousma E, Scott Dunn R, Lindquist D, Schnell BM, et al. (February 2012).
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Plexiform neurofibroma can cause disfigurement, neurological, and other clinical deficits.
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Ambrosini G, Cheema HS, Seelman S, Teed A, Sambol EB, Singer S, Schwartz GK (April 2008).
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Rotili A, De Maria F, Di Venosa B, Ghioni M, Pizzamiglio M, Cassano E, Moratti M (2018).
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Plexiform neurofibromas occur earlier in life and are thought to be congenital defects.
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that alter the developing tumor microenvironment and result in neurofibroma formation.
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of neurofibroma: A spindle cell lesion composed of slender fibroblast-like cells with
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Dermal neurofibromas (sometimes referred to as cutaneous neurofibromas) originate in
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Iino K, Matsumoto Y, Endo M, Kawakami K, Kasashima F, Sasaki H, Kawashima A (2006).
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is being studied for treatment of unresectable plexiform neurofibroma and low-grade
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Once a plexiform neurofibroma has undergone malignant transformation, radiation and
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gene in nonmyelinating Schwann cells that also exhibit biallelic inactivation of the
4039: 3805: 3470: 3319: 3225: 3173: 3043: 2818: 2753: 2427: 2307: 2268: 2227: 2219: 2178: 2137: 2129: 2088: 2080: 1917: 1909: 1794:"Neurofibromatosis 1: Current Issues in Diagnosis, Therapy, and Patient Management" 1749: 1729: 1694: 1651: 1628: 1606: 1559: 1524: 1479: 1471: 1423: 1413: 1323: 1313: 1272: 1231: 1221: 1194: 1174: 1134: 1126: 1069: 1012: 1002: 947:"Immunohistochemistry in the differential diagnosis of schwannoma and neurofibroma" 917: 909: 825: 815: 482: 199:
Dermal neurofibroma in a person whose lesions first appeared when he was a teenager
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Yamamoto M, Yamauchi T, Okano K, Takahashi M, Watabe S, Yamamoto Y (March 2009).
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for "Pegintron to Treat Plexiform Neurofibromas in Children and Young Adults" at
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Proceedings of the National Academy of Sciences of the United States of America
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Yang FC, Ingram DA, Chen S, Zhu Y, Yuan J, Li X, et al. (October 2008).
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Dermal neurofibromas can lead to stinging, itching, pain, and disfigurement.
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Zheng H, Chang L, Patel N, Yang J, Lowe L, Burns DK, Zhu Y (February 2008).
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Namazi H (May 2008). "ACE inhibitors: a novel treatment for neurofibroma".
1663: 1620: 1571: 1536: 1528: 1493: 1437: 1418: 1337: 1286: 1186: 1081: 1026: 931: 783: 670: 654: 474: 176:: Lie below and look like bumps on the skin, which can sometimes be tender. 1706: 1402:"MIA is a potential biomarker for tumour load in neurofibromatosis type 1" 1245: 1148: 3853: 3815: 3681: 3649: 3601: 3480: 3305: 3007: 2673: 2183: 2166: 840: 765: 698: 498: 470: 126: 119: 2418:
Ferner RE, O'Doherty MJ (December 2002). "Neurofibroma and schwannoma".
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As of 2002, the primary treatment option for plexiform neurofibroma was
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lasers have been used to remove dermal neurofibromas. In a paper titled
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created by the nonmyelinating Schwann cells. These cell types include
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Plexiform neurofibroma of the head and neck, before and after removal
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Muir D, Neubauer D, Lim IT, Yachnis AT, Wallace MR (February 2001).
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Johnson MR, Look AT, DeClue JE, Valentine MB, Lowy DR (June 1993).
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About 10% of plexiform neurofibromas undergo transformation into a
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for "R115777 in Treating Patients With Advanced Solid Tumors" at
1058: 628: 494: 490: 363: 359:. This gene codes for neurofibromin which is a large 220-250 KDa 232: 31: 1514: 339:
This picture illustrates the structure of the NF1 gene product,
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signalling, is being studied to treat plexiform neurofibromas.
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spanning 350kb of genomic data, and maps to chromosomal region
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WHO classification of the tumors of the central nervous system
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Benign nerve-sheath tumor in the peripheral nervous system
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Gottfried ON, Viskochil DH, Couldwell WT (January 2010).
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for "Study of PEG-Intron for Plexiform Neurofibromas" at
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Andrews' diseases of the skin : clinical dermatology
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for "Medical Treatment of "High-Risk" Neurofibromas" at
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Case Based Pediatrics For Medical Students and Residents
2298:"Angiogenesis and Therapeutic Approaches to NF1 Tumors" 2115: 1595:"Surgical treatment of a left ventricular neurofibroma" 606:
Laser for Treatment of Multiple Cutaneous Neurofibromas
1115:"Molecular genetics of neurofibromatosis type 1 (NF1)" 895: 1458:
Ostertag JU, Theunissen CC, Neumann HA (March 2002).
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growth. Studies showed no improvement over controls.
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may be used to detect the presence of neurofibromas.
2320: 441: 2417: 2300:. University of Florida Gainesville. Archived from 1258: 1112: 758:is being studied to treat plexiform neurofibromas. 2212:Journal of Developmental and Behavioral Pediatrics 1361:(10th ed.). Philadelphia: Saunders Elsevier. 489:factors such as the heparin-binding growth factor 3565: 2485:Diseases of the skin and appendages by morphology 1895: 1684: 1356: 1039: 965: 963: 653:. The neurofibroma was removed and the patient's 114:. This protein is responsible for regulating the 84:), while the remainder are found in persons with 4053: 1812:"Current Therapies for Neurofibromatosis Type 1" 1113:Shen MH, Harper PS, Upadhyaya M (January 1996). 578:Neurofibroma marked for biopsy, right upper back 1302:"Solitary breast neurofibroma: imaging aspects" 1160: 1158: 454:. While one defective allele may be inherited, 261:Image of neurofibroma showing myxoid appearance 960: 891: 889: 741:with sirolimus was studied to treat low-grade 182:: Involving tissues and organs underneath the 3551: 2970:Pityriasis lichenoides et varioliformis acuta 2470: 2205: 1799:. Denver: Mountain States Genetic Foundation. 1641: 98:Neurofibromas arise from nonmyelinating-type 2624:Dermatofibroma (benign fibrous histiocytoma) 1713: 1635: 1543: 1451: 1252: 1164: 1155: 3890:Embryonal tumour with multilayered rosettes 2171:The Tohoku Journal of Experimental Medicine 1678: 1201: 1052: 969: 886: 868:Rapini RP, Bolognia JL, Jorizzo JL (2007). 617: 3558: 3544: 2477: 2463: 1687:Clinical Orthopaedics and Related Research 1552:Archives of Orthopaedic and Trauma Surgery 1345:http://creativecommons.org/licenses/by/3.0 1106: 1040:Kluwe L, Hagel C, Mautner V (April 2007). 863: 861: 268: 39:Neurofibroma of the skin in a person with 30: 2272: 2231: 2182: 2141: 2092: 1921: 1791: 1610: 1483: 1427: 1417: 1327: 1317: 1276: 1235: 1225: 1138: 1016: 1006: 921: 780:, inhibits growth of neurofibroma cells. 222: 2206:Wetmore DZ, Garner CC (September 2010). 602:Hypertrophic Scars After Therapy with CO 588: 531: 446:Neurofibromas arise from nonmyelinating 334: 256: 231: 207: 194: 4011:Malignant peripheral nerve sheath tumor 3935:Primary central nervous system lymphoma 3859:Dysembryoplastic neuroepithelial tumour 1350: 858: 801:Malignant peripheral nerve sheath tumor 330: 281:malignant peripheral nerve sheath tumor 4054: 3277:Disseminated intravascular coagulation 1809: 1719: 944: 240:Plexiform neurofibromas can grow from 145: 3539: 2458: 1357:James WD, Berger T, Elston D (2006). 972:"Chapter XVIII.11. Neurofibromatosis" 2295: 1046:Atlas Genet Cytogenet Oncol Haematol 3697:Subependymal giant cell astrocytoma 174:Discrete subcutaneous neurofibromas 13: 3102: 3059:Postinflammatory hyperpigmentation 752:to treat plexiform neurofibromas. 14: 4078: 2960:Transient acantholytic dermatosis 2316: 902:The American Journal of Pathology 442:Loss of tumor suppressor function 252: 163:. Three kinds are distinguished: 3885:Atypical teratoid rhabdoid tumor 3069:Idiopathic guttate hypomelanosis 2432:10.1097/00019052-200212000-00004 1699:10.1097/00003086-199604000-00031 1612:10.1111/j.1540-8191.2005.00135.x 1476:10.1046/j.1524-4725.2002.01145.x 1443: 571: 409: 168:Discrete cutaneous neurofibromas 138:and plexiform neurofibromas are 110:gene that codes for the protein 4067:Dermal and subcutaneous growths 3079:Hypopigmented mycosis fungoides 2289: 2248: 2199: 2158: 2109: 2060: 2042: 2026: 2008: 1990: 1972: 1954: 1938: 1889: 1871: 1853: 1835: 1803: 1785: 1774: 1756: 1586: 1508: 1393: 1375: 1293: 190: 3979:Cranial and paraspinal nerves 3320:Lichen sclerosis et atrophicus 3028:Subcorneal pustular dermatosis 2654:Infantile digital fibromatosis 1096: 1033: 982: 970:Yamashiroya VK (August 2002). 938: 836:Palisaded encapsulated neuroma 677: 543:and very low amount of stroma. 513:. The mast cells then secrete 1: 3692:Pleomorphic xanthoastrocytoma 3567:Tumours of the nervous system 2912:Epidermolysis bullosa simplex 2749:Langerhans cell histiocytosis 2085:10.1158/1535-7163.MCT-07-0518 2073:Molecular Cancer Therapeutics 2037:National Institutes of Health 914:10.1016/S0002-9440(10)63992-2 851: 713:Farnesyltransferase inhibitor 583: 93:genetically inherited disease 3737:Anaplastic oligodendroglioma 3388:Systemic lupus erythematosus 3143:Systemic lupus erythematosus 2834:Systemic lupus erythematosus 2420:Current Opinion in Neurology 2412:Dorland's Medical Dictionary 2224:10.1097/DBP.0b013e3181ee3833 2122:Pediatric Blood & Cancer 846:List of cutaneous conditions 693: 664: 553:melanoma inhibitory activity 527: 311:of neurofibroma in terms of 227: 7: 2669:Lymphangioma circumscriptum 1722:Annals of Surgical Oncology 1119:Journal of Medical Genetics 794: 730:, a compound that inhibits 719: 686:indirectly down regulating 307:This section discusses the 78:solitary nerve sheath tumor 10: 4083: 3491:Mucous membrane pemphigoid 2274:10.3171/2009.11.FOCUS09221 1914:10.1016/j.cell.2008.08.041 1599:Journal of Cardiac Surgery 1008:10.1186/s12893-020-00761-4 945:Miller RT (October 2004). 622: 180:Deep nodular neurofibromas 150: 4035: 4019: 3947: 3925: 3902: 3872: 3828: 3798: 3768: 3745: 3722: 3672: 3663: 3643: 3634: 3610: 3582: 3573: 3454: 3421: 3365: 3350: 3341: 3298: 3269: 3248: 3239: 3192: 3151: 3120: 3109: 3091: 3036: 2978: 2920: 2857: 2777: 2706: 2695: 2686: 2601: 2565: 2497: 2490: 2324: 1734:10.1245/s10434-007-9737-5 1656:10.1007/s00247-008-0865-2 1564:10.1007/s00402-007-0303-1 1278:10.1016/j.ccr.2008.01.002 1074:10.1007/s00234-003-0964-6 870:Dermatology: 2-Volume Set 551:A blood test for protein 420:peripheral nervous system 70:peripheral nervous system 46: 38: 29: 24: 3864:Lhermitte–Duclos disease 3788:Choroid plexus carcinoma 3783:Choroid plexus papilloma 3256:Thrombocytopenic purpura 2902:Dermatitis herpetiformis 2887:Acute contact dermatitis 2839:Pityriasis rubra pilaris 2764:Wiskott–Aldrich syndrome 2734:Lichen simplex chronicus 2614:Epidermal inclusion cyst 1319:10.3332/ecancer.2018.800 636:malignant transformation 302: 217:malignant transformation 132: 86:neurofibromatosis type I 41:neurofibromatosis type I 3521:Squamous-cell carcinoma 3516:Systemic histoplasmosis 2907:Porphyria cutanea tarda 2537:Squamous-cell carcinoma 1227:10.1073/pnas.90.12.5539 414:There are two kinds of 351:gene is composed of 60 3707:Anaplastic astrocytoma 3702:Fibrillary astrocytoma 3496:Cicatricial pemphigoid 3413:Acne keloidalis nuchae 3408:Folliculitis decalvans 2296:Muir DF (April 2006). 2048:Clinical trial number 2014:Clinical trial number 1996:Clinical trial number 1978:Clinical trial number 1877:Clinical trial number 1859:Clinical trial number 1841:Clinical trial number 1762:Clinical trial number 1529:10.1212/wnl.58.10.1461 1419:10.1186/1741-7015-9-82 1167:Nature Reviews. Cancer 649:A neurofibroma on the 618:Plexiform neurofibroma 544: 456:loss of heterozygosity 404:tumor suppressor genes 344: 262: 237: 223:Plexiform neurofibroma 200: 104:biallelic inactivation 3963:Esthesioneuroblastoma 3687:Pilocytic astrocytoma 3398:Loose anagen syndrome 3325:Necrobiosis lipoidica 3261:Actinic/solar purpura 2935:Insect bite reactions 2724:Seborrheic dermatitis 2547:Merkel-cell carcinoma 2527:Molluscum contagiosum 1306:ecancermedicalscience 756:Peginterferon alfa-2b 535: 402:, are referred to as 338: 269:Medical complications 260: 235: 208:Medical complications 198: 82:sporadic neurofibroma 74:solitary neurofibroma 3968:Ganglioneuroblastoma 3873:CNS embryonal tumors 3778:Choroid plexus tumor 3221:Annulare centrifugum 2744:Glucagonoma syndrome 2542:Basal-cell carcinoma 2517:Seborrheic keratosis 2184:10.1620/tjem.217.193 1792:Viskochil D (2010). 1464:Dermatologic Surgery 872:. St. Louis: Mosby. 331:Neurofibromin 1 gene 3811:Gliomatosis cerebri 3466:Aphthous stomatitis 3403:Lichen planopilaris 3378:Androgenic alopecia 3184:Fixed drug eruption 2759:Pemphigus foliaceus 2659:Granular cell tumor 2261:Neurosurgical Focus 1644:Pediatric Radiology 737:The combination of 657:had to be replaced. 589:Dermal neurofibroma 146:Dermal neurofibroma 3975:Nerve sheath tumor 3917:Hemangiopericytoma 3486:Pemphigus vulgaris 3315:Granuloma annulare 3179:Carcinoid syndrome 3064:Tuberous sclerosis 3023:Coccidioidomycosis 2897:Bullous pemphigoid 2892:Pemphigus vulgaris 2824:Secondary syphilis 2714:Contact dermatitis 2304:on March 27, 2012. 2056:ClinicalTrials.gov 2022:ClinicalTrials.gov 2004:ClinicalTrials.gov 1986:ClinicalTrials.gov 1966:2012-04-20 at the 1951:, October 31, 2008 1885:ClinicalTrials.gov 1867:ClinicalTrials.gov 1849:ClinicalTrials.gov 1770:ClinicalTrials.gov 1389:News. 4 July 2011. 1131:10.1136/jmg.33.1.2 545: 345: 263: 238: 201: 90:autosomal-dominant 66:nerve-sheath tumor 4049: 4048: 3988:Neurofibromatosis 3943: 3942: 3898: 3897: 3824: 3823: 3732:Oligodendroglioma 3630: 3629: 3597:Craniopharyngioma 3533: 3532: 3529: 3528: 3373:Telogen effluvium 3337: 3336: 3333: 3332: 3294: 3293: 3290: 3289: 3235: 3234: 3087: 3086: 2955:Lichen spinulosus 2950:Keratosis pilaris 2829:Mycosis fungoides 2729:Stasis dermatitis 2719:Atopic dermatitis 2682: 2681: 2557:Trichoepithelioma 2532:Actinic keratosis 2392: 2391: 2134:10.1002/pbc.23015 1810:Klesse L (2010). 1523:(10): 1461–1470. 1368:978-0-7216-2921-6 1220:(12): 5539–5543. 879:978-1-4160-2999-1 806:Neurofibromatosis 541:storiform pattern 507:endothelial cells 503:perineurial cells 422:(PNS) axons with 125:. In contrast to 123:signaling pathway 58: 57: 19:Medical condition 4074: 4040:brain metastasis 4004:Acoustic neuroma 3806:Oligoastrocytoma 3799:Multiple/unknown 3670: 3669: 3661: 3660: 3641: 3640: 3615: 3590: 3580: 3579: 3560: 3553: 3546: 3537: 3536: 3471:Oral candidiasis 3348: 3347: 3246: 3245: 3174:Erythema nodosum 3118: 3117: 3107: 3106: 3100: 3099: 3044:Tinea versicolor 2882:Bullous impetigo 2819:Pityriasis rosea 2754:Lichen sclerosus 2739:Darier's disease 2704: 2703: 2693: 2692: 2649:Kaposi's sarcoma 2495: 2494: 2479: 2472: 2465: 2456: 2455: 2451: 2322: 2321: 2310: 2305: 2293: 2287: 2286: 2276: 2252: 2246: 2245: 2235: 2203: 2197: 2196: 2186: 2162: 2156: 2155: 2145: 2113: 2107: 2106: 2096: 2064: 2058: 2046: 2040: 2030: 2024: 2012: 2006: 1994: 1988: 1976: 1970: 1958: 1952: 1942: 1936: 1935: 1925: 1893: 1887: 1875: 1869: 1857: 1851: 1839: 1833: 1832: 1830: 1829: 1823: 1816: 1807: 1801: 1800: 1798: 1789: 1783: 1778: 1772: 1760: 1754: 1753: 1728:(5): 1538–1539. 1717: 1711: 1710: 1693:(325): 251–255. 1682: 1676: 1675: 1639: 1633: 1632: 1614: 1590: 1584: 1583: 1547: 1541: 1540: 1512: 1506: 1505: 1487: 1455: 1449: 1448: 1447: 1441: 1431: 1421: 1397: 1391: 1390: 1379: 1373: 1372: 1354: 1348: 1341: 1331: 1321: 1297: 1291: 1290: 1280: 1256: 1250: 1249: 1239: 1229: 1205: 1199: 1198: 1162: 1153: 1152: 1142: 1110: 1104: 1100: 1094: 1093: 1056: 1050: 1049: 1037: 1031: 1030: 1020: 1010: 986: 980: 979: 967: 958: 957: 951: 942: 936: 935: 925: 893: 884: 883: 865: 826:Proteus syndrome 816:Genetic disorder 575: 562:can be used for 519:survival factors 479:chemoattractants 466:in other cells. 219:has been found. 204:variable rates. 34: 22: 21: 4082: 4081: 4077: 4076: 4075: 4073: 4072: 4071: 4052: 4051: 4050: 4045: 4044: 4031: 4015: 3939: 3921: 3894: 3880:Medulloblastoma 3868: 3830: 3820: 3794: 3764: 3741: 3724:Oligodendrocyte 3718: 3653: 3647: 3645:Neuroepithelial 3626: 3611: 3606: 3583: 3569: 3564: 3534: 3525: 3457: 3450: 3417: 3383:Alopecia areata 3361: 3343: 3329: 3286: 3265: 3241: 3231: 3188: 3147: 3133:Viral exanthems 3111: 3095: 3093: 3083: 3054:Pityriasis alba 3032: 2974: 2916: 2853: 2773: 2769:Zinc deficiency 2699: 2697: 2678: 2606: 2597: 2561: 2552:Nevus sebaceous 2486: 2483: 2393: 2388: 2387: 2333: 2319: 2314: 2313: 2306:also available 2294: 2290: 2253: 2249: 2204: 2200: 2163: 2159: 2114: 2110: 2065: 2061: 2047: 2043: 2039:study 08-C-0130 2031: 2027: 2013: 2009: 1995: 1991: 1977: 1973: 1968:Wayback Machine 1959: 1955: 1943: 1939: 1894: 1890: 1876: 1872: 1858: 1854: 1840: 1836: 1827: 1825: 1821: 1814: 1808: 1804: 1796: 1790: 1786: 1779: 1775: 1761: 1757: 1718: 1714: 1683: 1679: 1640: 1636: 1591: 1587: 1548: 1544: 1513: 1509: 1456: 1452: 1442: 1398: 1394: 1381: 1380: 1376: 1369: 1355: 1351: 1342: 1298: 1294: 1257: 1253: 1206: 1202: 1179:10.1038/nrc1653 1163: 1156: 1111: 1107: 1101: 1097: 1057: 1053: 1038: 1034: 987: 983: 968: 961: 949: 943: 939: 894: 887: 880: 866: 859: 854: 821:Watson syndrome 797: 788:neurofibromin 1 722: 696: 680: 667: 625: 620: 612: 605: 599: 591: 586: 579: 576: 530: 444: 412: 341:neurofibromin 1 333: 305: 271: 255: 230: 225: 215:No evidence of 210: 193: 153: 148: 135: 20: 17: 12: 11: 5: 4080: 4070: 4069: 4064: 4047: 4046: 4036: 4033: 4032: 4030: 4029: 4023: 4021: 4017: 4016: 4014: 4013: 4008: 4007: 4006: 3992: 3991: 3990: 3985: 3977: 3972: 3971: 3970: 3965: 3954: 3952: 3945: 3944: 3941: 3940: 3938: 3937: 3931: 3929: 3923: 3922: 3920: 3919: 3914: 3908: 3906: 3900: 3899: 3896: 3895: 3893: 3892: 3887: 3882: 3876: 3874: 3870: 3869: 3867: 3866: 3861: 3856: 3851: 3849:Retinoblastoma 3846: 3840:Ganglioneuroma 3836: 3834: 3826: 3825: 3822: 3821: 3819: 3818: 3813: 3808: 3802: 3800: 3796: 3795: 3793: 3792: 3791: 3790: 3785: 3774: 3772: 3770:Choroid plexus 3766: 3765: 3763: 3762: 3757: 3751: 3749: 3743: 3742: 3740: 3739: 3734: 3728: 3726: 3720: 3719: 3717: 3716: 3715: 3714: 3709: 3704: 3699: 3694: 3689: 3678: 3676: 3667: 3658: 3638: 3632: 3631: 3628: 3627: 3625: 3624: 3618: 3616: 3608: 3607: 3605: 3604: 3599: 3593: 3591: 3577: 3571: 3570: 3563: 3562: 3555: 3548: 3540: 3531: 3530: 3527: 3526: 3524: 3523: 3518: 3513: 3508: 3506:Coxsackievirus 3503: 3498: 3493: 3488: 3483: 3478: 3473: 3468: 3462: 3460: 3452: 3451: 3449: 3448: 3443: 3438: 3433: 3427: 3425: 3419: 3418: 3416: 3415: 3410: 3405: 3400: 3395: 3390: 3385: 3380: 3375: 3369: 3367: 3363: 3362: 3360: 3359: 3356: 3354: 3345: 3339: 3338: 3335: 3334: 3331: 3330: 3328: 3327: 3322: 3317: 3312: 3302: 3300: 3296: 3295: 3292: 3291: 3288: 3287: 3285: 3284: 3279: 3273: 3271: 3267: 3266: 3264: 3263: 3258: 3252: 3250: 3243: 3237: 3236: 3233: 3232: 3230: 3229: 3223: 3218: 3216:Gyratum repens 3213: 3208: 3202: 3196: 3194: 3190: 3189: 3187: 3186: 3181: 3176: 3171: 3166: 3161: 3155: 3153: 3149: 3148: 3146: 3145: 3140: 3138:Toxic erythema 3135: 3130: 3128:Drug eruptions 3124: 3122: 3115: 3104: 3097: 3089: 3088: 3085: 3084: 3082: 3081: 3076: 3071: 3066: 3061: 3056: 3051: 3046: 3040: 3038: 3034: 3033: 3031: 3030: 3025: 3020: 3015: 3010: 3005: 3000: 2995: 2990: 2984: 2982: 2976: 2975: 2973: 2972: 2967: 2965:Lichen nitidus 2962: 2957: 2952: 2947: 2942: 2937: 2932: 2926: 2924: 2918: 2917: 2915: 2914: 2909: 2904: 2899: 2894: 2889: 2884: 2879: 2874: 2869: 2867:Herpes simplex 2863: 2861: 2855: 2854: 2852: 2851: 2846: 2841: 2836: 2831: 2826: 2821: 2816: 2810: 2805: 2800: 2795: 2789: 2783: 2781: 2775: 2774: 2772: 2771: 2766: 2761: 2756: 2751: 2746: 2741: 2736: 2731: 2726: 2721: 2716: 2710: 2708: 2701: 2690: 2684: 2683: 2680: 2679: 2677: 2676: 2671: 2666: 2661: 2656: 2651: 2646: 2641: 2636: 2631: 2626: 2621: 2616: 2610: 2608: 2599: 2598: 2596: 2595: 2590: 2585: 2580: 2575: 2569: 2567: 2563: 2562: 2560: 2559: 2554: 2549: 2544: 2539: 2534: 2529: 2524: 2519: 2514: 2509: 2503: 2501: 2492: 2488: 2487: 2482: 2481: 2474: 2467: 2459: 2453: 2452: 2426:(6): 679–684. 2415: 2407:"Neurofibroma" 2404: 2390: 2389: 2386: 2385: 2374: 2363: 2351: 2334: 2329: 2328: 2326: 2325:Classification 2318: 2317:External links 2315: 2312: 2311: 2288: 2247: 2218:(7): 564–581. 2198: 2177:(3): 193–201. 2157: 2128:(2): 173–180. 2108: 2079:(4): 890–896. 2059: 2041: 2025: 2007: 1989: 1971: 1953: 1937: 1908:(3): 437–448. 1888: 1870: 1852: 1834: 1802: 1784: 1773: 1755: 1712: 1677: 1634: 1605:(3): 278–280. 1585: 1558:(8): 709–712. 1542: 1507: 1470:(3): 296–298. 1450: 1392: 1374: 1367: 1349: 1292: 1271:(2): 117–128. 1251: 1200: 1173:(7): 557–564. 1154: 1105: 1095: 1068:(9): 618–625. 1062:Neuroradiology 1051: 1042:"Neurofibroma" 1032: 981: 959: 937: 908:(2): 501–513. 885: 878: 856: 855: 853: 850: 849: 848: 843: 838: 833: 828: 823: 818: 813: 808: 803: 796: 793: 721: 718: 695: 692: 683:ACE inhibitors 679: 676: 666: 663: 662: 661: 658: 651:left ventricle 647: 624: 621: 619: 616: 610: 603: 597: 590: 587: 585: 582: 581: 580: 577: 570: 564:histopathology 537:Histopathology 529: 526: 462:, that causes 443: 440: 411: 408: 388:mTOR-S6 kinase 332: 329: 317:cell signaling 304: 301: 270: 267: 254: 251: 229: 226: 224: 221: 209: 206: 192: 189: 188: 187: 177: 171: 152: 149: 147: 144: 134: 131: 56: 55: 53:Neuro-oncology 50: 44: 43: 36: 35: 27: 26: 18: 15: 9: 6: 4: 3: 2: 4079: 4068: 4065: 4063: 4062:PNS neoplasia 4060: 4059: 4057: 4043: 4041: 4034: 4028: 4025: 4024: 4022: 4018: 4012: 4009: 4005: 4002: 4001: 4000: 3996: 3993: 3989: 3986: 3984: 3981: 3980: 3978: 3976: 3973: 3969: 3966: 3964: 3961: 3960: 3959: 3958:Neuroblastoma 3956: 3955: 3953: 3950: 3946: 3936: 3933: 3932: 3930: 3928: 3927:Hematopoietic 3924: 3918: 3915: 3913: 3910: 3909: 3907: 3905: 3901: 3891: 3888: 3886: 3883: 3881: 3878: 3877: 3875: 3871: 3865: 3862: 3860: 3857: 3855: 3852: 3850: 3847: 3845: 3844:Ganglioglioma 3841: 3838: 3837: 3835: 3833: 3827: 3817: 3814: 3812: 3809: 3807: 3804: 3803: 3801: 3797: 3789: 3786: 3784: 3781: 3780: 3779: 3776: 3775: 3773: 3771: 3767: 3761: 3760:Subependymoma 3758: 3756: 3753: 3752: 3750: 3748: 3744: 3738: 3735: 3733: 3730: 3729: 3727: 3725: 3721: 3713: 3710: 3708: 3705: 3703: 3700: 3698: 3695: 3693: 3690: 3688: 3685: 3684: 3683: 3680: 3679: 3677: 3675: 3671: 3668: 3666: 3662: 3659: 3656: 3655:spinal tumors 3651: 3646: 3642: 3639: 3637: 3633: 3623: 3620: 3619: 3617: 3614: 3609: 3603: 3600: 3598: 3595: 3594: 3592: 3589: 3587: 3581: 3578: 3576: 3572: 3568: 3561: 3556: 3554: 3549: 3547: 3542: 3541: 3538: 3522: 3519: 3517: 3514: 3512: 3509: 3507: 3504: 3502: 3499: 3497: 3494: 3492: 3489: 3487: 3484: 3482: 3479: 3477: 3476:Lichen planus 3474: 3472: 3469: 3467: 3464: 3463: 3461: 3459: 3453: 3447: 3444: 3442: 3439: 3437: 3434: 3432: 3431:Onychomycosis 3429: 3428: 3426: 3424: 3420: 3414: 3411: 3409: 3406: 3404: 3401: 3399: 3396: 3394: 3393:Tinea capitis 3391: 3389: 3386: 3384: 3381: 3379: 3376: 3374: 3371: 3370: 3368: 3364: 3358: 3357: 3355: 3353: 3349: 3346: 3342:Miscellaneous 3340: 3326: 3323: 3321: 3318: 3316: 3313: 3311: 3307: 3304: 3303: 3301: 3297: 3283: 3280: 3278: 3275: 3274: 3272: 3268: 3262: 3259: 3257: 3254: 3253: 3251: 3247: 3244: 3240:Nonblanchable 3238: 3227: 3224: 3222: 3219: 3217: 3214: 3212: 3209: 3207: 3203: 3201: 3198: 3197: 3195: 3191: 3185: 3182: 3180: 3177: 3175: 3172: 3170: 3167: 3165: 3162: 3160: 3157: 3156: 3154: 3150: 3144: 3141: 3139: 3136: 3134: 3131: 3129: 3126: 3125: 3123: 3119: 3116: 3114: 3108: 3105: 3101: 3098: 3090: 3080: 3077: 3075: 3072: 3070: 3067: 3065: 3062: 3060: 3057: 3055: 3052: 3050: 3047: 3045: 3042: 3041: 3039: 3037:Hypopigmented 3035: 3029: 3026: 3024: 3021: 3019: 3016: 3014: 3011: 3009: 3006: 3004: 3001: 2999: 2996: 2994: 2991: 2989: 2988:Acne vulgaris 2986: 2985: 2983: 2981: 2977: 2971: 2968: 2966: 2963: 2961: 2958: 2956: 2953: 2951: 2948: 2946: 2943: 2941: 2940:Lichen planus 2938: 2936: 2933: 2931: 2928: 2927: 2925: 2923: 2919: 2913: 2910: 2908: 2905: 2903: 2900: 2898: 2895: 2893: 2890: 2888: 2885: 2883: 2880: 2878: 2875: 2873: 2872:Herpes zoster 2870: 2868: 2865: 2864: 2862: 2860: 2856: 2850: 2847: 2845: 2844:Parapsoriasis 2842: 2840: 2837: 2835: 2832: 2830: 2827: 2825: 2822: 2820: 2817: 2814: 2811: 2809: 2806: 2804: 2801: 2799: 2796: 2794: 2790: 2788: 2785: 2784: 2782: 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Index


neurofibromatosis type I
Specialty
Neuro-oncology
nerve-sheath tumor
peripheral nervous system
neurofibromatosis type I
autosomal-dominant
genetically inherited disease
Schwann cells
biallelic inactivation
neurofibromin
RAS
cell growth
signaling pathway
schwannomas
grade I
nerves
skin
dermis

malignant transformation

nerves
skin

malignant peripheral nerve sheath tumor
CDKN2A
TP53
tumorigenesis

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