You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Porencephaly refers to – and explain in detail?
Porencephaly Refers to the presence of cysts or cavities within the brain, that may results from

Developniental 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 development
Lissencephaly        -          Also called agyria
Characterized 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 morphogenesis
Porencephaly        -          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.