Which of the following is the COMMONEST cause of pyometra?
**Core Concept**
Pyometra refers to the accumulation of pus in the uterine cavity, often due to an obstruction of the normal drainage pathway. This condition can be caused by various factors, including malignancies, infections, and anatomical abnormalities.
**Why the Correct Answer is Right**
The commonest cause of pyometra is **endometrial cancer**, particularly adenocarcinoma. This type of cancer can obstruct the normal drainage pathway of the uterus, leading to the accumulation of pus. The obstructed pathway can cause the endometrium to become infected, resulting in pyometra. The cancer cells can also produce enzymes that break down the uterine tissue, making it more susceptible to infection.
**Why Each Wrong Option is Incorrect**
**Option A:** Uterine fibroids are a common cause of abnormal uterine bleeding, but they are not typically associated with pyometra.
**Option B:** Pelvic inflammatory disease (PID) can cause infection of the upper genital tract, but it is not the commonest cause of pyometra.
**Option C:** Uterine prolapse can cause obstruction of the normal drainage pathway of the uterus, but it is not the commonest cause of pyometra.
**Clinical Pearl / High-Yield Fact**
It's essential to note that pyometra can be a complication of endometrial cancer, and a high index of suspicion should be maintained in patients with postmenopausal bleeding or abnormal vaginal discharge.
**Correct Answer:** D. Endometrial cancer.