title: [A case of retroperitoneal ancient schwannoma in the pelvis].
abstract: We treated a case of retroperitoneal ancient schwannoma in the pelvis detected incidentally at a health examination without clinical manifestation in a 59-year-old Japanese man found to have hypertension. Computed tomography showed a heterogeneously enhanced 8 x 7 cm solid mass in the pelvic retroperitoneal space. Magnetic resonance imaging revealed an encapsulated tumor, showing a low intensity on the T1-weighted image, heterogeneously high intensity on the T2-weighted image and the tumor homogeneously enhanced with Gd-DTPA. It was suspected to be a mesenchymal tumor. The tumor was resected en bloc. The histologic examination of the extirpated tumor was an ancient schwannoma. A total of 11 retroperitoneal ancient schwannoma cases were reviewed.
authors.affiliation: Department of Urology, Kakegawa Municipal Hospital.
authors.forename: M
authors.initials: M
authors.lastname: Nakano
authors.forename: K
authors.initials: K
authors.lastname: Miwa
authors.forename: Y
authors.initials: Y
authors.lastname: Kanimoto
mesh_terms: D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009442:Neurilemmoma / Q000175:diagnosis* / Q000473:pathology; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000473:pathology