Commonest cause of pyometra
**Core Concept**
A pyometra is a condition characterized by the accumulation of pus in the uterine cavity, often resulting from an obstructed or infected uterus. The commonest cause of pyometra is typically related to the menstrual cycle and uterine anatomy.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of the menstrual cycle and the anatomy of the uterus. Typically, the commonest cause of pyometra is a **Diverticulum of the uterus**, also known as a **uterine horn** or **cervical canal diverticulum**. This is a congenital anomaly where the uterine cavity protrudes into the cervix, creating a diverticulum that can accumulate pus. When the uterine lining (endometrium) sheds during menstruation, it can lead to infection and accumulation of pus in the diverticulum.
**Why Each Wrong Option is Incorrect**
* **Option A:** Endometrial hyperplasia is a condition characterized by excessive growth of the uterine lining, but it is not a direct cause of pyometra.
* **Option B:** Uterine fibroids are benign tumors that can cause various symptoms, including pelvic pain and heavy bleeding, but they are not typically associated with pyometra.
* **Option C:** Cervical cancer can cause abnormal vaginal bleeding and other symptoms, but it is not the most common cause of pyometra.
**Clinical Pearl / High-Yield Fact**
It's essential to recognize that pyometra can be a life-threatening condition if left untreated, requiring prompt medical attention to prevent sepsis and other complications.
**Correct Answer: D. Diverticulum of the uterus**