title: [Intraneural perineurioma: an unusual nerve sheath tumor].
abstract: We report a case of intraneural perineurioma, developed in the left cubital nerve, in a five-year old girl. This intraneural tumor is rare and shows a typical histologic appearance: concentric whorls of perineurial cells EMA+, PS100-, around nerve fibers. This tumor must be distinguished from extraneural or soft tissue perineurioma, also composed of perineurial cells, with distinct clinical presentation and histological appearance.
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D018317:Nerve Sheath Neoplasms / Q000473:pathology*; D010524:Peripheral Nervous System Neoplasms / Q000473:pathology*