Obstructive voiding symptoms are most commonly due to prostatic hyperplasia, but other causes include bladder neck contractures, prostatic carcinomas, neurogenic bladder, and urethral stricture. Symptoms include hesitancy, dribbling, decreased force of stream, and postvoid fullness. Imaging is useful in evaluating the presence and degree of hydronephrosis, estimation of renal function, evaluation of the bladder and prostate, and detection of incidental upper tract malignancies or stones. Various modalities have been used for evaluation of the cause of obstruction. Literature on the indications and usefulness of these radiologic studies for obstructive voiding symptoms in different clinical settings is reviewed.
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