The uterus, which is also referred to as the womb, is a hollow muscular organ that is located deep within the pelvic cavity, between the bladder and the rectum in females. When a woman is pregnant, the uterus enlarges in order to accommodate the growing embryo but shrinks back to its normal size gradually after delivery. While uterine enlargement is a normal consequence of pregnancy, various benign and malignant growths in the uterus can also cause an enlarged womb.