CASE HISTORY/EXAMINATION
A 31-year-old woman with history of sudden onset, dull and intermittent type right-sided flank pain presented to emergency. She did not give history of hematuria, burning micturition, urinary frequency, urgency, or fever. She was diagnosed to have a right renal mass on radiological examination. She underwent a right radical nephrectomy, the histopathology of which revealed a sarcomatoid tumor with positive immunostaining of myoid markers (smooth muscle actin and Desmin) and was thus diagnosed as a case of renal leiomyosarcoma.