AROI-ESTRO GYN Teaching Course

Delineation of OARs

• Sigmoid colon: Should be clearly identified, and the whole structure should be contoured, with specific focus on the areas adjacent to the uterus. Length up to the junction with the descending colon. • Rectum : This implies the entire length from the ano- rectum to the recto-sigmoid junction • Bladder: The whole posterior, posterior-caudal (trigone), and posterior-cranial bladder wall should be included till bladder neck