title: Retroperitoneal ancient schwannoma presenting as an adrenal incidentaloma: CT and MR findings.
abstract: A 35-year-old woman was referred to our institution for additional examinations to evaluate bilateral suprarenal masses incidentally found on abdominal ultrasonographic images obtained during an annual medical health checkup. Our computed tomographic scans showed bilateral and well-circumscribed low-density suprarenal masses, while MRI revealed the tumors to be heterogeneous with low intensity on T1-weighted images and high intensity on T2-weighted images. A laparoscopic adrenalectomy was performed under the suspicion of a malignant tumor, such as a malignant fibrous histiocytoma. Pathologic findings indicated a retroperitoneal ancient schwannoma of two histologic types: Antoni A and Antoni B. We considered that elucidation of the characteristic features of a schwannoma would provide helpful preoperative information for diagnosis.
authors.affiliation: Division of Endocrinology and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, and Department of Urology, Nishinomiya Municipal Central Hospital, Hyogo, Japan.
authors.forename: Taku
authors.initials: T
authors.lastname: Inokuchi
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Takiuchi
authors.forename: Yuji
authors.initials: Y
authors.lastname: Moriwaki
authors.forename: Tuneyoshi
authors.initials: T
authors.lastname: Ka
authors.forename: Sumio
authors.initials: S
authors.lastname: Takahashi
authors.forename: Zenta
authors.initials: Z
authors.lastname: Tsutsumi
authors.forename: Hiroki
authors.initials: H
authors.lastname: Shima
authors.forename: Seiichi
authors.initials: S
authors.lastname: Hirota
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yamamoto
mesh_terms: D000005:Abdomen / Q000000981:diagnostic imaging; D000310:Adrenal Gland Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009442:Neurilemmoma / Q000000981:diagnostic imaging / Q000473:pathology*; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography