title: Retroperitoneal malignant fibrous histiocytoma can mimic a hydatid cyst.
abstract: Malignant fibrous histiocytoma is the second most common soft-tissue sarcoma in adults. After the extremities, the retroperitoneal space is the second most common site of this tumor. A 50-year-old man presented with a right retroperitoneal, thick-walled, cystic multilocular mass measuring 10 × 10 cm that was thought to be a type CE 5 hydatid cyst preoperatively. However, the postoperative histopathology did not agree with the radiological findings and instead showed a malignant fibrous histiocytoma. The computed tomography and ultrasound/Doppler ultrasound findings of this retroperitoneal mass mimicked a type CE 5 hydatid cyst. We present this case because the surgical management of these two lesions differs and misdiagnosis can be problematic.
authors.affiliation: Department of Radiology, Faculty of Medicine, Başkent University, 01250 Adana, Turkey.
authors.forename: Gurcan
authors.initials: G
authors.lastname: Erbay
authors.forename: Serife
authors.initials: S
authors.lastname: Ulusan
authors.forename: Zafer
authors.initials: Z
authors.lastname: Koc
authors.forename: Emine Tuba
authors.initials: ET
authors.lastname: Canpolat
authors.forename: Kenan
authors.initials: K
authors.lastname: Calıskan