Retroperitoneal Extraovarian Fibrothecoma Mimicking a Malignant Epithelial Ovarian Carcinoma

Figure 1

CT axial image of lower abdomen/pelvis demonstrating large predominantly solid mass (arrows) that appears to be arising from the retroperitoneum, surrounding sigmoid colon (Sig) and extending into peritoneal cavity. Mass is surrounded by a large amount of ascites (As).