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John Lipman, MD, Vascular & Interventional Radiology, answeredFibroids are benign, non-cancerous tumors that involve the uterus. Fibroids can be classified based on their location in the uterus. There are 3 types of fibroids based on this classification. 1. Submucosal: along the lining of the uterus, 2. Intramural: in the muscular portion of the uterus, and 3. Subserosal: along the outer surface of the uterus.