title: Mediastinal meningioma.
abstract: A case of meningioma appearing to arise from the stellate ganglion and associated with a unilateral Horner syndrome of long standing is presented. Clinical absence of central nervous system involvement and a normal computerized tomographic scan of the brain favor the neoplasm as being a primary extracranial meningioma. Light and electron microscopy showed characteristic structural features. A brief review of the literature is made, and theories concerning the origin of extracranial primary meningioma are presented.
mesh_terms: D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000473:pathology*; D008579:Meningioma / Q000473:pathology* / Q000556:secondary / Q000648:ultrastructure; D008875:Middle Aged