title: [Primary primitive neuroectodermal tumor of the urinary bladder. Clinicopathologic case report and differential small cell tumor diagnosis of this site].
abstract: We report a rare case of primary primitive neuroectodermal tumour of the bladder in an adult. A huge tumour with extensions into pelvic and retroperitoneal tissue was found radiologically in a 62-year-old man. The patient did not complain about remarkable clinical symptoms until 4 days before admission to hospital. Histology of diagnostic transurethral tumour resection showed a small round-cell tumour with focal necrosis and scattered Homer-Wright rosettes. Immunohistochemical analysis revealed that tumour cells stained positively with 013, a monoclonal antibody which recognizes the membrane glycoprotein p30/32MIC2. Focally, tumour cells stained positively for vimentin, NSE, S-100 protein and synaptophysin. The patient died 3 weeks later because of fulminant pulmonary embolism and autopsy revealed a huge, partly exophytic but mainly endophytic tumour of the bladder with extensions into the rectum and retroperitoneal tissue. The differential diagnosis of small round-cell tumours in this location is discussed.
authors.affiliation: Institut für Pathologie, Friedrich-Schiller-Universität Jena.
authors.forename: T
authors.initials: T
authors.lastname: Mentzel
authors.forename: J
authors.initials: J
authors.lastname: Flaschka
authors.forename: H J
authors.initials: HJ
authors.lastname: Mentzel
authors.forename: G
authors.initials: G
authors.lastname: Eschholz
authors.forename: D
authors.initials: D
authors.lastname: Katenkamp
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis; D003937:Diagnosis, Differential; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D018242:Neuroectodermal Tumors, Primitive / Q000473:pathology*; D001743:Urinary Bladder / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor