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Table 1 Tumour and organ at risk contoured volumes

From: The impact of contour variation on tumour control probability in anal cancer

Tumour Volumes Organs at Risk
Primary clinical target volume to receive 54Gy (CTV54p) Small bowel
Nodal clinical targe volume to receive 54Gy (CTV54n) Bladder
Elective clinical target volume to receive 45Gy (CTV45) External genitalia
Note: CTV45 included mesorectal, pre-sacral, internal iliac, external iliac, obturator and inguinal lymph nodes Head and neck of femur
Bone marrow (ilium)