A Rare Case of Concurrent SNRPB Mutation and 22q11.2 Microduplication in a Child With Cerebro‐Costo‐Mandibular Syndrome

We present a unique case of an infant born with both a microduplication of 22q11.2 and SNRPB gene mutations suggestive of cerebro‐costo‐mandibular syndrome (CCMS). Microduplications of 22q11 are known to present with a variety of phenotypes ranging from asymptomatic to significant physical and mental health challenges. CCMS is a rare autosomal dominant condition caused by a mutation in the SNRPB gene and typically presents with posterior rib malformations and branchial arch deformities. There have been less than 100 reported cases of CCMS in the literature, and this may be the first documented case of a patient with both CCMS and a 22q11 microduplication.