**Question:** The most common complication of an ovarian tumor is:

A. Ovarian torsion
B. Ovarian rupture
C. Pelvic or abdominal pain
D. Secondary infertility

**Core Concept:** Ovarian tumors, also known as ovarian masses, can be benign or malignant. They can affect women of all ages and are composed of various cell types. Ovarian tumors can lead to complications depending on their size, location, and type.

**Why the Correct Answer is Right:** The most common complication of an ovarian tumor is **B. Ovarian rupture**. This occurs when the tumor becomes large and exerts pressure on surrounding organs, leading to increased pressure and impaired blood flow. Eventually, the tumor may rupture, causing severe abdominal pain, hemoperitoneum, and potentially life-threatening complications.

**Why Each Wrong Option is Incorrect:**

A. **Ovarian torsion** is a less common complication of ovarian tumors. It occurs when the ovarian vessels become twisted, interrupting blood flow to the tumor and surrounding tissue. Although it is a potential complication, it is not the most common one compared to ovarian rupture.

C. **Pelvic or abdominal pain** is a symptom of an ovarian tumor, but not a specific complication. It is not the correct answer because it does not address the unique complication associated with ovarian tumors.

D. **Secondary infertility** is a consequence of ovarian tumors rather than a complication. While infertility is a possible outcome, it does not directly relate to the specific issue presented in the question.

**Clinical Pearl:** Ovarian tumor complications highlight the importance of proper evaluation and management to minimize severe outcomes. Early detection and referral to a gynecologist or oncologist are essential to ensure appropriate intervention and patient care.