Obstructive uropathy is structural or functional hindrance of normal urine flow, sometimes leading to renal dysfunction (obstructive nephropathy). Symptoms, less likely in chronic obstruction, may include pain radiating to the T11 to T12 dermatomes and abnormal voiding (eg, difficulty voiding, anuria, nocturia, and/or polyuria). Diagnosis is based on results of bladder catheterization, cystourethroscopy, and imaging (eg, ultrasonography, CT, pyelography), depending on the level of obstruction. Treatment, depending on cause, may require prompt drainage, instrumentation, surgery (eg, endoscopy, lithotripsy), hormonal therapy, or a combination of these modalities.