Leiomyosarcoma of the bladder is a very rare tumor and it has been reported in less than 200 cases in the literature which represent 0.1% of all nonurothelial bladder tumors. We experienced a case of sarcoma of bladder that protruding into the urinary bladder in 51-year-old woman. She underwent mass excision with enucleation for the bladder function preservation. Pathologically, the mass consisted of high grade leiomyosarcoma. In immunohistochemical study, tumor showed positive reactions for

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... oth muscle actin and desmin. After mass excision, follow-up radiation treatment is ongoing. Herein, we present the case of a high-grade leiomyosarcoma with literature review. (Korean J Urol Oncol 2019;17:66-69)