Fig. 1

Axial T2-weighted images of a low risk T3ab tumour without MRF involvement (a) and a high-risk T3cd tumour with MRF involvement (b). The left patient is a 52 year old male patient with a tumour that extends beyond the muscularis propria from approximately 12 till 2 o’clock (white arrows) with an extramural invasion depth of < 5 mm. There is a sufficient margin (> 1 mm) between the tumour and MRF. The right patient is a 55-year-old female patient with extensive extramural invasion from 4 to 6 o’clock with broad-based involvement of the MRF (white arrowheads)