<prompt> Most common cause of hydrocephalus in children is?Post inflammatory obstructionBuddchiary syndromeBrain tumourPerinatal injury  <response>: Ans. is a i.e., Post inflammatory obstruction o Answer of this question is none because :- o MC cause of obstructive non-communicating hydrocephalus aqueductal stenosis. MC cause of non-obstructive communicating hydrocephalus subarachanoid hemorrhage. o But, amongst the given options best answer is option a. A common cause of acquired hydrocepahalus, is post inflammatory obstruction. Bacterial and tuberculous meningitis have a propensity to produce thick tenacious exudate that obstructs the basal cisterns. 