Opitz-Kaveggia Syndrome, also known as fg syndrome, is related to fg syndrome 3 and fg syndrome 5, and has symptoms including constipation and seizures. An important gene associated with Opitz-Kaveggia Syndrome is MED12 (Mediator Complex Subunit 12), and among its related pathways/superpathways are Metabolism and Nervous system development. Affiliated tissues include testes and heart, and related phenotypes are macrocephaly and high palate