Question

Which one of the following is the most common extrauterine site to be affected by endometriosis?

• A. Vagina
• B. Rectovaginal septum
• C. Sigmoid colon
• D. Broad ligament (except tubes and ovaries)

Hint:

The ovary is the top site overall but is not an option here, so look for the next most frequent one.

Answer 1

The Correct Option is B

Endometriosis is the growth of tissue like the uterine lining in places outside the uterus. The ovary tops the list of common sites, but it is not one of the four choices given, so we need the most frequent site among vagina, rectovaginal septum, sigmoid colon, and broad ligament.

1. Vagina: true vaginal involvement is uncommon and usually happens only when disease spreads there from a nearby structure.
2. Rectovaginal septum: this tissue plane between the vagina and rectum is one of the most frequently affected areas outside the ovary, often producing firm, tender nodules that a doctor can feel on examination.
3. Sigmoid colon: bowel involvement does occur because the sigmoid colon sits close to the pelvic organs, but it is less common than involvement of structures nearer the uterus, such as the rectovaginal septum.
4. Broad ligament (except tubes and ovaries): the broad ligament itself can carry implants, but surgical series find this less often than septal or ligament disease closer to the cervix.

Putting these together, the rectovaginal septum ranks highest among the four given choices for how often it is involved by endometriosis.

Let's summarize:

• The original paper left this answer blank, so the choice here rests on standard gynaecology teaching about site frequency.
• Among the options given, the rectovaginal septum is the most commonly affected extrauterine site.

So the corrected answer is rectovaginal septum.