Cortical malformations secondary to abnormal neuronal and glial CELL PROLIFERATION or APOPTOSIS in NEUROGENESIS. This group includes congenital MICROCEPHALIES; MICROLISSENCEPHALIES, megalencephalies, HEMIMEGALENCEPHALIES and cortical dysplasias with balloon cells.

Synonyms: Malformations of Cortical Development, Group I, Malformations Secondary to Abnormal Neuronal and Glial Proliferation or Apoptosis, Abnormal Proliferation Cortical Malformations, Cortical Malformations, Group I, Malformations Due to Abnormal Neuronal and Glial Proliferation or Apoptosis