What condition is characterized by the presence of endometrial tissue outside the uterus?

• A. Polycystic ovary syndrome (PCOS)
• B. Endometriosis
• C. Uterine fibroids
• D. Pelvic inflammatory disease

Answer: (B)

The presence of endometrial tissue outside the uterus is characteristic of endometriosis. This condition involves the growth of tissue similar to the lining of the uterus in areas such as the ovaries, fallopian tubes, the outer surface of the uterus, and other organs within the pelvis. It often leads to pain, especially during menstruation, and can result in scar tissue and adhesions, contributing to complications such as infertility.

In contrast, polycystic ovary syndrome (PCOS) is primarily an endocrine disorder that affects ovarian function and is characterized by a combination of symptoms such as irregular menstrual cycles, excess androgen levels, and polycystic ovaries noted on ultrasound. Uterine fibroids are benign tumors of the uterine muscle that can cause symptoms like heavy menstrual bleeding and pressure symptoms, but they are not composed of endometrial tissue. Pelvic inflammatory disease refers to an infection and inflammation of the female reproductive organs, often due to sexually transmitted infections, and does not involve the pathological growth of endometrial tissue outside the uterus. Hence, endometriosis is the condition that directly matches the description provided.