**4.3 Obstructive uropathy**

The number of factors causing obstruction to the urinary flow increases the risk of urosepsis significantly. The congenital factors causing obstruction to the urinary flow are ureteric or urethral strictures, phimosis, ureterocele and polycystic kidney disease, whereas the acquired aetiological factor leading to urinary flow obstruction are calculi, prostatic hypertrophy, tumours of the urinary tract, trauma, pregnancy and the radiation therapy causing fibrosis [12].
