A and B, Axial and sagittal T2-weighted MR images show biopsy-proved myxoid liposarcoma of the posterior thigh. C and D, Intraoperative photographs of resection show that the sciatic nerve passed through the tumor and had to be sacrificed. E, Photomicrograph (H&E, ×10) shows bland cells in a myxoid matrix with a surrounding capillary network.