Which of the following is NOT a structural cause of AUB?

Coagulopathy is not classified as a structural cause of abnormal uterine bleeding (AUB). Structural causes refer to identifiable physical changes or abnormalities in the reproductive organs that can lead to bleeding, such as growths or lesions.

Polyp, adenomyosis, and leiomyoma are all examples of structural changes within the uterus. Polyps are abnormal tissue growths that can develop on the uterine lining; adenomyosis involves the uterine lining growing into the muscular wall; and leiomyomas, also known as fibroids, are benign tumors of the uterine muscle. Each of these conditions can lead to AUB due to their physical presence and effects on the uterine lining and overall uterine function.

In contrast, coagulopathy refers to disorders related to blood clotting that can result in excessive bleeding but do not originate from structural issues within the uterus itself. Instead, coagulopathy affects the body's ability to stop bleeding, which can lead to abnormal bleeding but not due to a physical alteration or structure within the reproductive system. Understanding the distinction between structural and non-structural causes is crucial for diagnosis and treatment in gynecological practice.