title: Periurethral neurofibroma.
abstract: A periurethral neurofibroma presenting as a midline perineal mass was removed in a three-year-old boy. An immunohistochemical study of S-100 protein distribution within the tumor tissue was performed.
mesh_terms: D002675:Child, Preschool; D006801:Humans; D008297:Male; D009455:Neurofibroma / Q000032:analysis / Q000473:pathology*; D010502:Perineum; D009418:S100 Proteins / Q000032:analysis; D014523:Urethral Neoplasms / Q000032:analysis / Q000473:pathology*
chemical_list: D009418:S100 Proteins