Ritscher-Schinzel syndrome 1 (MONDO_0009073) is any Ritscher-Schinzel syndrome in which the cause of the disease is a mutation in the WASHC5 gene. Also known as: Ritscher-Schinzel syndrome caused by mutation in WASHC5, Ritscher-Schinzel syndrome type 1, WASHC5 Ritscher-Schinzel syndrome.