Gynae BT 2017

Anorectum

Varying definitions of rectum in RT studies and practice

Superior:

Rectosigmoid junction 12 cm from the anus Top of acetabula At the level of  S3 Inferior level of sacroiliac joints 1 cm above the PTV

Inferior:

Anal verge Ano-rectal junction 1cm below PTV Ischial tuberosities Ischial tuberosities + 2 cm

Circumferential:

Rectum + contents Rectal wall