1. Ureteral or urethral obstruction by strictures, stones, external compression, pelvic tumors, and so forth 2. Obstructing tumors of bladder; congenital defects in bladder or urethra 3. Prostatic obstruction (tumor or benign hypertrophy; a very common cause in elderly men) Prerenal azotemia etiologies can be divided into two main categories: (1) decreased blood volume or […]