Fig. 12. Typical MRI findings of pathologic complete response after CRT.

A. Baseline MRI (left) shows fungating tumor (arrow) with intermediate SI in lower rectum. DWI (right) demonstrates prominent diffusion restriction at tumor (arrow). B. Post-CRT MRI (left) reveals transmural fibrosis with dark SI in left lateral wall of rectum (arrow). There is no demonstrable residual tumor with intermediate SI. DWI (right) shows no evidence of diffusion restriction at corresponding tumor site.