The most common complication of an untreated urinary obstruction due to a ureteral calculus is:
A. Hydronephrosis
B. Renal artery stenosis
C. Ureteral rupture
D. Kidney mass
ANS: A
Hydronephrosis is swelling of the renal pelvis caused by an obstructing stone, ureteral stricture, prostatic hyperplasia, or renal or abdominal tumor that prevents the kidney from draining. The obstruction can be unilateral or bilateral, symptoms can be sudden or gradual in onset, and progressive renal damage will occur with time.
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