<prompt> Which is the most common cause of delayed urinary tract obstruction after Trans Urethral Resection of Prostrate TURP:Stricture of the Navicular fossaStricture of the membranous urethraStricture of the bulb of urethraBladder neck stenosis  <response>: Bladder neck stenosis is the most common cause of obstructive symptoms following Trans Urethral Resection of Prostrate TURP. Its due to the presence of a tight membrane at the neck of the bladder. Ref: Transurethral resection By John Peter Blandy, Richard G. Notley, John Reynard, Page 190-91; Contemporary Issues in Prostate Cancer: A Nursing Perspective By Jeanne Held-Warmkessel, Page 167. 