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A neurofibroma is a benign nerve-sheath tumor in the peripheral nervous system. In 90% of cases, they are found as stand-alone tumors (solitary neurofibroma, solitary nerve sheath tumor[1] or sporadic neurofibroma[1]), while the remainder are found in persons with neurofibromatosis type I (NF1), an autosomal-dominant genetically inherited disease.
Schwannomatosis. Schwannomatosis is an extremely rare genetic disorder closely related to the more-common disorder neurofibromatosis (NF). Originally described in Japanese patients, [1] it consists of multiple cutaneous schwannomas, central nervous system tumors, and other neurological complications, excluding hallmark signs of NF.
Neurofibromatosis type I is the most common of the three types and is caused by genetic changes in the NF1 gene located on chromosome 17 (17q11.2). This gene encodes a cytoplasmic protein known the neurofibromin, which functions as a tumor suppressor and therefore serves as a signal regulator of cell proliferation and differentiation.
The fibroma cavernosum or angiofibroma, consists of many often dilated vessels, it is a vasoactive tumor occurring almost exclusively in adolescent males. The cystic fibroma (fibroma cysticum) has central softening or dilated lymphatic vessels. The myxofibroma (fibroma myxomatodes) is produced by liquefaction of the underlying soft tissue.
Main symptoms of neurofibromatosis type I. [7] Diagnostic criteria of neurofibromatosis type I, requiring at least 2 of the mentioned items. [8] Neurofibromatosis type 1 is the most common phakomatosis and it affects approximately 1 in 2500-3000 live births. [9] It is a genetic disorder due to a germline mutation in the NF1 gene.
Neurofibromatosis type II (NF2 or NF II) is caused by mutations of the "Merlin" gene, [2] which seems to influence the form and movement of cells. The principal treatments consist of neurosurgical removal of the tumors and surgical treatment of the eye lesions. Historically the underlying disorder has not had any therapy due to the cell ...
A Neurothekeoma (NT) is a type of rare benign cutaneous tumor that usually develops on the head and neck. They often occur in the second and early third decades of life and tend to afflict women more frequently than men. [1] First described by Richard L Gallager and Elson B. Helwig, who proposed the term in order to reflect the presumed origin ...
Specialty. Neuro-oncology. A schwannoma (or neurilemmoma) is a usually benign nerve sheath tumor composed of Schwann cells, which normally produce the insulating myelin sheath covering peripheral nerves. Schwannomas are homogeneous tumors, consisting only of Schwann cells. The tumor cells always stay on the outside of the nerve, but the tumor ...