**Core Concept**
Uterine fibroids, also known as leiomyomas, are benign tumors of the smooth muscle layer in the uterus. They are common in women of reproductive age and can cause various complications due to their location and growth patterns. The complications of fibroids can be broadly categorized into those related to their size, location, and number.

**Why the Correct Answer is Right**
The least common complication of fibroids is typically considered to be malignant transformation, which is extremely rare. However, one of the most common complications is not listed in the options. Instead, we'll focus on the least common complication among the options provided.

**Why Each Wrong Option is Incorrect**
**Option A:** Not provided.
**Option B:** Not provided.
**Option C:** Not provided.
**Option D:** Not provided.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that while fibroids are benign tumors, they can cause significant morbidity due to their impact on fertility, menstrual bleeding, and overall quality of life. A thorough understanding of the potential complications and their management is crucial for obstetricians and gynecologists.

**Correct Answer:** Not provided.