Computed tomography scan of the abdominal tumor. (a) Computed tomography (CT) scan at the time of the initial patient visit. A CT scan obtained before the operation reveals a bulky 30 × 23 × 15 cm mass in the right retroperitoneal space, ranging from the undersurface of the liver to the pelvis. The tumor contained a clustered contrast-filled bulkhead and cyst-like structure. (b) CT scan performed at 38 days after the debulking surgery. At 38 days after successfully performed debulking surgery, the formerly small residual tumor is noted to have progressed rapidly, returning to the size of the tumor observed before surgery. (c) CT scan after chemotherapy. CT scan shows reduction in tumor size in response to five cycles of chemotherapy with doxorubicin and ifosfamide. (d) CT scan after radiotherapy. The residual tumor continued to shrink following the completion of radiation therapy.