Cranio-cerebello-cardiac (3C) syndrome is a rare multiple congenital anomalies syndrome characterized by craniofacial (prominent occiput and forehead, hypertelorism, ocular coloboma, cleft palate), cerebellar (Dandy-Walker malformation, cerebellar vermis hypoplasia) and cardiac (tetralogy of Fallot, atrial and ventricular septal defects) anomalies (see these terms).

Cleft palate is a developmental defect of the palate resulting from a failure of fusion of the palatine processes and manifesting as a separation of the roof of the mouth (soft and hard palate).