Smooth muscle tumors are abnormal growths that arise from smooth muscle tissue, which is found in various organs such as the stomach, intestines, and blood vessels. These tumors can be benign, meaning they are non-cancerous, or malignant, which means they can spread to other parts of the body. The most common type of smooth muscle tumor is leiomyoma, often found in the uterus. Diagnosis typically involves imaging tests like ultrasound or MRI, and sometimes a biopsy is performed to confirm the tumor type. Treatment options may include surgery to remove the tumor, especially if it causes symptoms or is malignant. Regular monitoring may be necessary for benign tumors.