Megalencephaly, also known as macroencephaly, is related to megalencephaly-capillary malformation-polymicrogyria syndrome and megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome. An important gene associated with Megalencephaly is CCND2 (Cyclin D2), and among its related pathways/superpathways are Prolactin Signaling and NFAT and Cardiac Hypertrophy. Affiliated tissues include brain and spinal cord, and related phenotypes are megalencephaly and macrocephaly