title: Leydig cell tumor of the testis: a cytohistological, immunohistochemical, and ultrastructural case study.
abstract: We report a case of Leydig cell tumor of the testis in a young man, in whom preoperative diagnosis was achieved by fine-needle aspiration biopsy cytology. Cytology, histology, and ultrastructural examination showed diagnostic Reinke's crystals, both in nuclei and in cytoplasm. Immunohistochemistry displayed strong vimentin and estrogen positivity.
authors.affiliation: Department of Pathology, Legnano General Hospital, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Assi
authors.forename: M
authors.initials: M
authors.lastname: Sironi
authors.forename: A M
authors.initials: AM
authors.lastname: Bacchioni
authors.forename: P
authors.initials: P
authors.lastname: Declich
authors.forename: L
authors.initials: L
authors.lastname: Cozzi
authors.forename: G
authors.initials: G
authors.lastname: Pasquinelli
mesh_terms: D000328:Adult; D001707:Biopsy, Needle; D006801:Humans; D007150:Immunohistochemistry; D007984:Leydig Cell Tumor / Q000473:pathology*; D008297:Male; D013736:Testicular Neoplasms / Q000473:pathology*; D013737:Testis / Q000473:pathology*