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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

–

1 cm below PTV

–

Ischial tuberosities

–

Ischial tuberosities + 2

cm

•

Circumferential

–

Rectum + contents

–

Rectal wall