A lobulated uterus is a uterus that is enlarged or divided into lobules. WebMD states that there are several reasons for an enlarged uterus, including pregnancy and uterine fibroids.
While a woman is pregnant, her uterus can increase from pear-size to watermelon-size. Uterine fibroids are benign growths that form on the uterus wall. WebMD states that as many as eight in 10 women experience uterine fibroids by the age of 50. Genetics and hormones can contribute to uterine fibroid growth.
Adenomyosis can also cause the uterus to enlarge. Adenomyosis occurs when the tissue lining of the uterus moves to the uterus's outer wall. This condition is most common in women who have no children and are over the age of 30, according to WebMD.