A rare, lethal, genetic, multiple congenital anomaly disorder characterized by the triad of brain malformation mainly occipital encephalocele, large polycystic kidneys, and polydactyly as well as associated abnormalities that may include cleft lip/palate, cardiac and genital anomalies, central nervous system (CNS) malformations, liver fibrosis, and bone dysplasia. The disease is MONDO_0018921 (Meckel syndrome). Also known as: Meckel-Gruber syndrome.