RESUMEN
Leiomyomas are benign soft tissue neoplasms that arise from smooth muscles. Leiomyosarcomais a malignant lesion of smooth muscle origin. This is a rare lesion in the uterus with 1-2 % of its benign counterpart, leiomyoma, transforming into the lesion. It is often aggressive and could develop at any site where the smooth muscle is found. We present a case of a 48-year-old farmer with pelvic mass with Ultra-sonography(USS) suggestive of leiomyoma. Hysterectomy was done and histologic diagnosis of leiomyosarcoma (LMS) was made. The patient was discharged 7 days post operation but was lost to follow up. Uterine LMS is an aggressive tumour, therefore, a high index of suspicion is needed especially for huge uterine nodules and such patients must be closely monitored for adequate management