TUMOUR

Tumour location (eg. low, mid or high)

Length of tumour

Degree of circumferential involvement

Distance of tumour to anal verge

Tumour relationship to ano-rectal junction

Tumour relationship to anterior peritoneal reflection

Shortest distance of tumour to meso-rectal fascia (MRF)

Presence or absence of extra-mural venous invasion (EMVI)

T-stage of tumour