**Question:** Pyometra commonly occurs following:

A. Hysterectomy
B. Ovarian cystectomy
C. Cervical stenosis
D. Oophorectomy

**Core Concept:** Pyometra is a condition characterized by the accumulation of pus in the uterine cavity due to a disruption or obstruction of the normal drainage pathways.

**Why the Correct Answer is Right:** Pyometra is most commonly seen following a surgical intervention that involves the uterus, specifically when there is disruption or obstruction to the normal drainage pathways. In this case, the correct answer is D: Oophorectomy (removal of ovaries).

**Why Each Wrong Option is Incorrect:**
A. Hysterectomy (removal of the uterus) and B. Ovarian cystectomy (removal of ovarian cysts) do not typically involve the uterus's drainage pathways, making them less likely causes of pyometra.
C. Cervical stenosis (narrowing of the cervix) might obstruct the uterine drainage, but it is less commonly associated with pyometra compared to oophorectomy.

**Clinical Pearl / High-Yield Fact:** Pyometra is a serious complication in postmenopausal women, as it can lead to rupture of the uterus and severe sepsis. Early recognition and appropriate intervention are crucial for patient management and outcomes.

**Correct Answer:** D. Oophorectomy (removal of ovaries)

In summary, pyometra commonly occurs following oophorectomy due to the removal of ovaries, which can disrupt the normal drainage pathways of the uterus. This can lead to the accumulation of pus in the uterine cavity. The other options (hysterectomy, ovarian cystectomy, and cervical stenosis) are less commonly associated with pyometra due to the different surgical interventions involved and their impacts on uterine drainage.