Cerebrocostomandibular syndrome

Cerebrocostomandibular syndrome (CCMS), also known as rib gap syndrome, is an extremely rare congenital disorder characterized by a distinctive triad of severe micrognathia (undersized jaw), palatal defects (cleft palate or high-arched palate), and posterior rib gaps or defects. The rib abnormalities are the hallmark of this condition, consisting of gaps in the posterior portions of the ribs where bone is replaced by fibrous or cartilaginous tissue, giving a characteristic appearance on chest X-rays. These rib defects can lead to a small, bell-shaped thorax and significant respiratory difficulties in the neonatal period, which may be life-threatening. The syndrome primarily affects the skeletal system, particularly the ribs and mandible, as well as the respiratory system due to thoracic insufficiency. Additional features may include hearing loss, intellectual disability (in some cases), tracheomalacia, glossoptosis, and feeding difficulties. Some patients may also exhibit spinal anomalies and short stature. The severity of the condition is highly variable; some affected individuals experience severe neonatal respiratory distress requiring intensive care, while others have milder presentations and survive into adulthood with fewer complications. Most cases of cerebrocostomandibular syndrome have been linked to pathogenic variants in the SNRPB gene, which encodes a core component of the spliceosome involved in pre-mRNA processing. There is no specific cure for CCMS, and management is supportive and multidisciplinary. Treatment focuses on airway management (which may include tracheostomy or mandibular distraction osteogenesis), respiratory support, feeding assistance, and surgical correction of palatal defects. Long-term follow-up with pulmonology, orthopedics, and speech therapy is typically required. With appropriate early intervention, many patients who survive the neonatal period can have a favorable long-term prognosis.

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