Least common complication of fibroid is :
**Core Concept**
Fibroids are benign tumors that arise from the smooth muscle layer of the uterus, leading to various complications. The complications of fibroids are often related to their size, location, and number. Understanding the pathophysiology of fibroids is essential to identifying their potential complications.
**Why the Correct Answer is Right**
The least common complication of fibroids is malignant transformation, also known as leiomyosarcoma. This occurs when a fibroid undergoes malignant change, leading to the development of a rare and aggressive tumor. The exact mechanism of this transformation is not well understood, but it is thought to be related to genetic mutations and alterations in the tumor suppressor genes.
**Why Each Wrong Option is Incorrect**
**Option A:** Infertility is a common complication of fibroids, particularly if they are large or located in the uterine cavity.
**Option B:** Dysmenorrhea (painful menstruation) and menorrhagia (heavy menstrual bleeding) are also common complications of fibroids, often due to their location and size.
**Option C:** Red degeneration of fibroids is a painful complication that occurs when a fibroid outgrows its blood supply, leading to necrosis and inflammation.
**Clinical Pearl / High-Yield Fact**
Fibroids are the most common benign tumors of the uterus, affecting up to 80% of women by age 50. They can cause a range of symptoms, from mild to severe, and may require surgical intervention in some cases.
**Correct Answer:** D. Malignant transformation.