<prompt> Which is the most common cause of ventriculomegaly in newborn?Dandy Walker syndromeArnold Chiari malformationAqueductal stenosisArachnoid villi malfunction  <response>: - Ventriculomegaly is seen in neonates with hydrocephalus. - Obstructive or noncommunicating hydrocephalus develops most commonly in children dt abnormality of aqueduct of Sylvius or a lesion in the fouh ventricle. - Nonobstructive or communicating hydrocephalus most commonly follows a subarachnoid hemorrhage, which is usually a result of intraventricular hemorrhage in a premature infant. 