North American Veterinary Licensing Examination (NAVLE) Practice Test 2026 - Free NAVLE Practice Questions and Study Guide

Uterine leiomyoma, commonly referred to as a fibroid, is the most likely cause of a large uterine mass in an intact female potbellied pig. Female potbellied pigs are prone to various reproductive disorders, particularly those related to hormonal influences associated with the estrous cycle and prolonged estrogen exposure.

Leiomyomas are benign tumors of smooth muscle and are one of the most frequently encountered tumors in the reproductive tract of many species, including potbellied pigs. These tumors can grow significantly large, leading to noticeable abdominal distension or mass effects, which would be characteristic in an intact female pig. The presence of such a mass is often related to the animal's reproductive history, including factors such as age and cycles of estrogen stimulation.

While adenocarcinoma of the cervix and endometrial hyperplasia could also present with uterine masses, leiomyomas are generally more common in intact female pigs. Lymphosarcoma, though a possibility, tends to present with systemic signs of illness rather than a singular large mass in the reproductive tract, making it less likely in this specific context. The distinctive presentation and common occurrence of uterine leiomyoma support its designation as the likely cause in this scenario.