Uterine polyps. Light micrograph (LM) of a section through a uterus with polyps. Uterine polyps are growths attached to the inner wall of the uterus. Overgrowth of cells in the lining of the uterus (endometrium) leads to the formation of uterine polyps, also known as endometrial polyps. Polyps are prone to bleeding and large polyps can contribute to infertility and miscarriage. Uterine polyps can develop in pre- or post-menopausal women. These polyps are usually noncancerous (benign), although some can be cancerous or can eventually turn into cancer (precancerous polyps). Human tissue. Magnification: x50 when printed at 10 centimetres tall.