**Core Concept**
Uterine artery embolization (UAE) is a minimally invasive procedure used to treat various conditions by blocking the blood supply to the uterus. It involves the insertion of a catheter into the uterine artery, followed by the injection of embolic agents to occlude the blood flow.

**Why the Correct Answer is Right**
UAE is primarily used to treat postpartum hemorrhage (PPH), fibroids, and pelvic artery bleeding in cases of cesarean section. The procedure works by reducing blood flow to the uterus, thereby decreasing bleeding and alleviating symptoms. This is particularly useful in patients with severe PPH or those who are at high risk of complications from surgical intervention. The embolization of the uterine artery causes ischemia, leading to the reduction of fibroid size or cessation of bleeding.

**Why Each Wrong Option is Incorrect**
**Option A:** Pelvic inflammatory disease (PID) - UAE is not a suitable treatment for PID, which requires antibiotics and, in some cases, surgical intervention.
**Option B:** Uterine cancer - Embolization is not a primary treatment for uterine cancer; instead, it may be used as an adjunct to surgery or other treatments.
**Option C:** Ectopic pregnancy - Medical management or surgical intervention is typically the preferred treatment for ectopic pregnancy.

**Clinical Pearl / High-Yield Fact**
UAE is a valuable treatment option for patients with severe PPH or fibroids, offering a minimally invasive alternative to surgery. However, it is essential to carefully select patients for UAE, considering factors such as the size and location of the fibroids, patient's overall health, and the presence of any contraindications.

**Correct Answer: C. Pelvic artery bleeding in cases of cesarean section**