Leiomyosarcoma is a rare entity in prostate but it is the most common type of prostate sarcomas in adult patients. In most reported series the prognosis is poor and the median survival is about 15-18 months. Hereby we present a 72 years old man who received combined modality treatment including radical surgery followed by adjuvant chemotherapy and radiotherapy. He has been well for 14 months, but now he is suffering from lung metastases and asymptomatic local recurrence. Iran . J. Radiat. Res., 2004; 1(4): 229-231