title: Mucinous cystadenoma of the testis.
abstract: A 35-year-old man complained of a painless enlargement of the right testis. Imaging diagnostic procedures demonstrated a multiloculated cystic tumor, 9 cm in maximal diameter, in the right testis with hydrocele. Orchidectomy specimen showed that the tumor was confined within the testis and separated from the epididymis. The locules of the tumor were lined by single-layered columnar epithelium, intermingled with MUC2 immunopositive goblet and chromogranin-A immunopositive neuroendocrine cells, exhibiting intestinal differentiation. No ciliated cell, teratomatous element or intratubular germ cell neoplasia were seen. Channels of rete testis were compressed peripherally by the tumor but there was no connection with the tumor locules. The tumor was diagnosed as mucinous cystadenoma of the testis. This seems to be the first published case of benign mucinous cystadenoma occurring within the testis. This intratesticular tumor with intestinal differentiation may represent a benign monodermal teratoma.
authors.affiliation: Department of Pathology, Jichi Medical School, Tochigi, Japan. nokubi@ms.jichi.ac.jp
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Nokubi
authors.forename: Toshiro
authors.initials: T
authors.lastname: Kawai
authors.forename: Sumitaka
authors.initials: S
authors.lastname: Mitsu
authors.forename: Shinya
authors.initials: S
authors.lastname: Ishikawa
authors.forename: Shojiroh
authors.initials: S
authors.lastname: Morinaga
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000032:analysis; D053379:Chromogranin A; D002864:Chromogranins / Q000032:analysis; D018291:Cystadenoma, Mucinous / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D008297:Male; D055262:Mucin-2; D009077:Mucins / Q000032:analysis; D013736:Testicular Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D013737:Testis / Q000473:pathology; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor; D053379:Chromogranin A; D002864:Chromogranins; C524625:MUC2 protein, human; D055262:Mucin-2; D009077:Mucins