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Quick Answer. Endometrial hyperplasia is an abnormal thickening of the lining of the uterus, according to the American Congress of Obstetricians and Gynecologists. The condition usually develops during menopause and perimenopause when ovulation is irregular or absent. It can also occur in women affected by polycystic ovary syndrome or obesity.
The thickening of the uterine lining which is seen on ultrasound does not necessarily mean that someone has endometriosis. A thickening in the muscular walls of the uterus MIGHT suggest that endometriosis is inside the walls. This is called adenosis. More commonly, a thickened uterine lining is either from hormonal influences--or from polyps of the lining of the uterus (endometrial polyps).