title: Perivascular epithelioid tumor of urinary bladder and vagina.
abstract: Perivascular epithelioid cell tumors are recently characterized neoplasms composed of large clear HMB-45-positive epithelioid cells arranged in an organoid pattern. The histogenesis of these neoplasms remain obscure. We report here 2 such tumors in young female patients aged 19 and 16 years involving the urinary bladder and vagina, respectively (in the absence of the tuberous sclerosis complex) . Microscopically, both tumors were composed of perivascularly arranged cells with granular eosinophilic fluffy cytoplasm, round-to-oval nuclei, and prominent nucleoli. Melanin pigmentation was present in the vaginal tumor. Immunohistochemically, both tumors strongly expressed HMB-45. They were negative for cytokeratin, vimentin, and S-100. The vaginal tumor recurred 10 months after resection and chemotherapy. The patient with the bladder tumor was lost to follow-up.
authors.affiliation: New Cross Hospital NHS Trust, Wolverhampton, WV 11 1XX West Midlands, UK.
authors.forename: Karthik
authors.initials: K
authors.lastname: Kalyanasundaram
authors.forename: Ashok
authors.initials: A
authors.lastname: Parameswaran
authors.forename: Rama
authors.initials: R
authors.lastname: Mani
mesh_terms: D000293:Adolescent; D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis; D015622:Epithelioid Cells / Q000378:metabolism / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D009364:Neoplasm Recurrence, Local / Q000378:metabolism / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000378:metabolism / Q000473:pathology*; D014625:Vaginal Neoplasms / Q000378:metabolism / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor