MRI scans for the recurrent tumor. (A) Axial fat-suppressed T2WI; (B) Sagittal fat-suppressed T2WI; (C) Diffusion weighted imaging (DWI); (D) Contrast-enhanced fat-suppressed T1WI. In this case, the giant oval mass (arrowhead) with homogeneous isointensity signal was well demonstrated on T2WI (A, B). Note, the balloon catheter (arrow) was placed into the bladder. On DWI (C), the tumor (arrowhead) appears hyper-intensity signal compared with hypointensity signal of background. On contrast-enhanced MRI (D), the tumor mildly enhanced and the necrosis component (*) did not enhanced. Note, the mass-rectum margin was not clear (arrow), indicating the tumor invaded the anterior wall of rectum.