Porencephaly refers to -

Ans is 'c' i.e., Vascular Lesions due to degenerative vessel disease and Head Injury Porencephaly Refers to the presence of cysts or cavities within the brain, that may results from Developmental defects (True porencephalic cysts). Acquired lesions of infarction of tissues. AV malformation or infarcts or (Pseudoporencephalic cysts). Defects of NeuronalMigration : malformations of coical development Lissencephaly Also called agyria Characterized by absence of cerebral convolutions and poorly formed syln 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 morphogenesis F encephaly 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.