In intracavitary brachytherapy for carcinoma of the cervix, Point A is defined as:

• A 2 cm above the external os in the midline and 2 cm lateral to it ✓
• B 5 cm above the external os and 5 cm lateral to the midline
• C At the midpoint of the vaginal source axis
• D At the junction of the upper and middle third of the vagina in the midline

Explanation

Point A lies 2 cm above the lateral vaginal fornix (equivalently 2 cm above the external os) and 2 cm lateral to the midline, corresponding to the paracervical region where the uterine vessels cross the ureter. It represents the site of parametrial dose prescription. Point B, 3 cm further lateral, reflects obturator nodal dose. The definitions in options B, C and D do not correspond to any standard Manchester system reference point.

Reference: Berek and Novak's Gynecology, 16th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.