Thick pachygyria Posterior predominant thick cortex pachygyria 2019-09-03T13:01:16Z Pachygyria with cortical thickness over 10 mm posterior predominant Occipital predomimant classic pachygyria Pachygyria with cortical thickness above 10 mm with and a posterior predominant severity gradient. The severity gradient is determined based on the gyral width, with gyri typically wider than 5mm over the more severely affected regions. Posterior predominant gradient indicates pachygyria more severe other the occipital lobes but also includes a rare perisylvian-predominant pachygyria and a temporal predominant pachygyria.