The patient passed a 4 mm stone in his urine. Does he have a 3mm stone in the renal pelvis found on an ultrasound?

The patient passed a 4 mm stone in his urine. Does he have a 3mm stone in the renal pelvis found on an ultrasound?
A . ESWL
B . None
C . Surgery
D . Dormia basket
E . PCNL

Answer: B

Explanation:

Stones less than 5 mm in diameter pass spontaneously in up to 80% of people. -Stones between 5 mm and 10 mm in diameter pass spontaneously in about 50% of people. -Stones larger than 1 cm in diameter usually require intervention.