3C syndrome

3C syndrome, also known as Ritscher-Schinzel syndrome or craniocerebellocardiac syndrome, is a rare congenital disorder characterized by the combination of cranial, cerebellar, and cardiac malformations — hence the name '3C.' The condition affects multiple body systems, most prominently the brain, heart, and craniofacial structures. Key craniofacial features include macrocephaly, prominent forehead, hypertelorism (widely spaced eyes), depressed nasal bridge, and downslanting palpebral fissures. Cerebellar abnormalities typically involve Dandy-Walker malformation or other posterior fossa defects, which can contribute to developmental delay and intellectual disability of variable severity. Congenital heart defects are common and may include septal defects, hypoplastic left heart, and other structural cardiac anomalies. The syndrome was first described by Ritscher and Schinzel in 1987. Both autosomal recessive and autosomal dominant forms have been identified. Autosomal recessive forms (Ritscher-Schinzel syndrome 1) are caused by mutations in the KIAA0196 gene (also known as WASHC5), while an autosomal dominant form (Ritscher-Schinzel syndrome 2) has been linked to mutations in the CCDC22 gene, and a third form involves the WASHC5 gene as well. Additional features may include ocular anomalies, cleft palate, skeletal abnormalities, and growth retardation. The severity of the condition varies considerably among affected individuals. There is no cure for 3C syndrome, and management is supportive and symptom-based. Treatment typically involves surgical correction of congenital heart defects when indicated, neurosurgical intervention for hydrocephalus or Dandy-Walker malformation if needed, and developmental support services including physical therapy, occupational therapy, and speech therapy. Regular monitoring by a multidisciplinary team including cardiologists, neurologists, and developmental specialists is recommended. Prognosis depends largely on the severity of cardiac and neurological involvement, with some patients surviving into adulthood while others may have a more guarded outcome due to severe cardiac malformations.

Common questions about 3C syndrome