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Case Rep Radiol. 2011;2011:362391. doi: 10.1155/2011/362391. Epub 2011 Sep 21.

Retroperitoneal malignant fibrous histiocytoma can mimic a hydatid cyst.

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1
Department of Radiology, Faculty of Medicine, Başkent University, 01250 Adana, Turkey.

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.

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