Polymicrogyria

**Definition:** Heterogeneous disorders of cortical malformation characterized by excessive and small fused gyri and shallow sulci of the CORTEX with abnormal cortical lamination. It is considered a malformation secondary to abnormal post-migrational development of the neurons during cerebral cortical development and is associated with EPILEPSY and learning difficulties.

**Tree numbers:** - C10.500.507.500.500 - C16.131.666.507.500.500

**Synonyms:** - Cerebral Micropolygyria - Cerebral Polymicrogyria - Micropolygyria