English Polymicrogyria Cited by user Ozzie10aaaa on 24 Dec 2016 The time of onset has yet to be identified, however it has been found to occur before birth in either the earlier or later stages of brain development.
English Polymicrogyria Cited by user KpocMU on 26 Apr 2016 Time of onset is not specifically identified but ranges in early and later stages in development of the brain before birth.