Figure 2
Right retroperitoneal solitary fibrous tumor in a 61-year-old woman. (A) Transverse arterial phase shows a huge soft tissue mass fused by multiple nodules of varying sizes, and the solid part is in moderate, uneven enhancement. (B and C) Multi-planar reconstruction in venous phase shows that the solid part of the tumor is in more significant, sustained, uneven enhancement, no enhancement in low-density cystic areas, but envelope enhancement is visible. (D) The solid part has sustained enhancement in the delayed phase. (E) Tumor cells were fusiform with a bundle-like, spiral arrangement under the microscope, rich sinusoids and interstitial collagen denaturation were observed in the focus areas.