Pelvic hydatid cyst
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An 83×78×73mm thick-walled cystic lesion is noted at left lower pelvis which extends from lower aspect of left ovary until level of obturator muscles. No soft tissue component is present within the cyst. The lesion erodes medial aspect of left acetabulum but there is no CT-detectable intra-articular extension. Fat plane between the lesion and adjacent pelvic structures is intact. A little amount free fluid is noted at posterior cul-de-sac.
Large pelvic cystic lesion with an adjacent acetabular defect. Hydatid cyst is the main diagnosis, subsequently proven.