Figure 1. (a) MRI of a T2 N0 tumour deemed operable by MR appearance, with no poor prognostic features. (b) MRI of a bulky, circumferential, rectal cancer with features indicating invasion into the mesorectal fascia and close circumferential resection margins. (c) MRI appearance of locally advanced rectal cancer with extension of disease to the left pelvic side wall, making this an inoperable cancer.