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Inherited genetic syndromes and meningiomas.

Meningiomas arising with inherited genetic syndromes occur nearly exclusively in the context of neurofibromatosis type 2 (NF2). NF2 is an autosomal dominant familial neoplasia syndrome that results from a mutation in the NF2 tumor suppressor gene located on the long arm of chromosome 22. The NF2 gene encodes for the protein merlin (moesin-ezrin-radixin-like protein), which has tumor suppressive effects that are reduced/inactivated in NF2-associated tumors. NF2-associated neoplasms affect the nervous system (schwannomas, meningiomas, ependymomas, astrocytomas, and neurofibromas) and skin. Other NF2 findings include ophthalmological lesions and peripheral neuropathy. Meningiomas are the second most frequent NF2-associated tumors (occurring in approximately half of all NF2 patients). They are often multiple and have unpredictable growth patterns. NF2-associated meningiomas can cause significant morbidity and mortality due to their location and a mass effect. Because of the multiplicity, frequent development of new tumors, and their protean nature, defined treatment strategies with serial surveillance is critical for optimal management of NF2-associated meningiomas. While surgical resection is the primary treatment for NF2-associated meningiomas, radiation plays an important adjunctive role in the management of recurrent and inoperable meningiomas.

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