Leiomyomatosis is a rare medical condition in which multiple tumors develop in the smooth muscle tissue of the body. While there are not many synonyms for the word leiomyomatosis, there are several terms that describe the different types and locations of these tumors. These include uterine fibroids, which are leiomyomas that grow in the uterus; gastric leiomyomas, which develop in the stomach lining; and leiomyosarcomas, which are malignant tumors that form in smooth muscle tissue. Other related words include leiomyoma, a singular tumor formed from smooth muscle cells, and myoma, a non-cancerous tumor that can grow in any muscle or organ.