Retroperitoneal Malignant Fibrous Histiocytoma Can Mimic a Hydatid Cyst

Figure 1

Abdominal precontrast CT shows a thick-walled, cystic, multilocular mass, measuring 10 × 10 cm in front of the right psoas and iliopsoas muscles and adjacent to the iliac vessels. Spotty calcification (black arrow) was seen in the thick, hyperdense wall. White arrow shows fluid-fluid levels.