Figure 5 Case 5. (a) Sagittal T2-weighted images show a circumferential rectal mass involving middle and lower rectum with about 6 cm from anal verge. (b) Axial T2-weighted images show circumferential mass of intermediate signal intensity infiltrating mesorectal fascia with invasion to the uterus and posterior wall of the bladder. (c) Coronal T2-weighted images show a rectal mass with internal iliac lymph of mixed signal intensity measuring 13 mm in short axis diameter. (d) Axial T1-weighted images show a circumferential rectal mass with invasion to the uterus and the bladder.