<prompt> Most common uropathic obstruction in children isStrictureStonesPosterior urethral valveAnterior urethral valve  <response>: C. i.e. Posterior urethral valve 1362 -B L 25th 1289 - S. Das 5thPOSTERIOR URETHRAL VALVES are the most common obstructive urethral lesion in newborn and infants males and most common cause of end stage renal disease in boys 1008 - CSDT 12th They are usually just distal to the verumontanum Most reliable method to confirm the diagnosis is voiding cystourethrography Definitive treatment by transurethral resection of the valveMarions Disease - congenital obstruction of the neck of the bladder 