Figure 4 Case 4. (a) Sagittal T2-weighted images show circumferential rectal mass involving middle and lower rectum with about 5 cm from anal verge. (b) Axial T2-weighted images show a circumferential mass of intermediate signal intensity infiltrating rectal wall with speculation reaching perirectal fat with maximum distance from mesorectal fascia of 12 mm. (c) Coronal T2-weighted images show a rectal mass and perirectal fat with no evidence of EXMVI or perirectal lymph node. (d) Diffusion-weighted image shows a rectal mass of restrictive diffusion that invades mesorectal fascia.