thoracic malformation sternal cleft https://rarediseases.info.nih.gov/diseases/5012/sternal-cleft https://www.malacards.org/card/sternal_cleft UMLS:C2931507 MESH:C537489 sternum bifidum ICD9:756.3 GARD:0005012 Sternal cleft (SC) is a rare idiopathic congenital thoracic malformation characterized by a sternal fusion defect, that can be complete or partial (either superior or inferior), that is usually asymptomatic in the neonatal period (apart from a paradoxical midline thoracic bulging) but that can lead to dyspnea, cough, frequent respiratory infections and increased risk of trauma-related injury to the heart, lungs and major vessels if left untreated. congenital sternal cleft MONDO:0016066 SCTID:54008006 Orphanet:2017 MEDGEN:419096 icd11.foundation:1308914573 cleft sternum