Locate the renal stone with pain radiating to medial side of thigh and perineum due to slipping of stone in males:
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.
At pelvic brim
Intramural opening of ureter
Junction of ureter and renal pelvis
At crossing of gonadal vessels and ureter