<prompt> Porencephaly refers toFoetal alcohal syndromeDandy-walker-syndromeVascular lesion due to degenerative vessel disease and head injuryNeural tube defects  <response>: Porencephaly Refers to the presence of cysts or cavities within the brain, that may results fromDevelopniental defects True porencephalic cysts.Acquired lesions of infarction of tissues. i.e. Vascular lesions - AV malformation or infarcts or Pseudo-porencephalic cysts.Defects of NeuronalMigration : malformations of cortical developmentLissencephaly - Also called agyriaCharacterized by absence of cerebral convolutions and poorly formed sylvian fissure giving the appearance of 3-4 months fetal brain.Schizencephaly - Presence of unilateral or bilateral clefts within the cerebral hemisphere due to an Abnormality of morphogenesisPorencephaly - Presence of cysts cavities within the brain that result from developmental defects or acquired lesions including infarction of tissue.Holoprosencephaly - Developmental disorder of brain that results from defective cleavage of prosencephalon. 