Which is the most common cause of delayed urinary tract obstruction after Trans Urethral Resection of Prostrate (TURP):

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.