Abnormal oral cavity morphology Oral cleft SNOMEDCT_US:66948001 The presence of a cleft in the oral cavity, the two main types of which are cleft lip and cleft palate. In cleft lip, there is the congenital failure of the maxillary and median nasal processes to fuse, forming a groove or fissure in the lip. In cleft palate, there is a congenital failure of the palate to fuse properly, forming a grooved depression or fissure in the roof of the mouth. Clefts of the lip and palate can occur individually or together. It is preferable to code each defect separately. UMLS:C4021813 HP:0000202 human_phenotype SNOMEDCT_US:253983005 Oral clefting Cleft of the mouth Cleft lip/palate UMLS:C0158646 Cleft lip, cleft palate