<prompt> Locate the renal stone with pain radiating to medial side of thigh and perineum due to slipping of stone in males:At pelvic brimIntramural opening of ureterJunction of ureter and renal pelvisAt crossing of gonadal vessels and ureter  <response>: Answer is A At pelvic brim: Pain radiating to medial side of thitth and perineum suggetsts a stone in lower poion of ureter proximal to orifice or at pelvic brim. 