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There is a large multiloculated lobulated cystic mass (13.5 x 9 x 8.5 cm) of the right half of the bony pelvis, composed of numerous cysts of various size. It involves mainly the iliac wing, acetabular roof, superior/inferior rami, and ischial tuberosity. It elicits an iso-to low signal as compared to the muscles on T1, high T2/STIR with a thin peripheral rim of enhancement on postcontrast sequences. There is an extension to the adjacent soft tissues mainly the obturator internus/externus muscles as well as the right sacroiliac joint.