Isolated cleft lip

Isolated cleft lip (also known as nonsyndromic cleft lip, or cleft lip without cleft palate) is a congenital malformation characterized by a gap or opening in the upper lip that occurs when the facial structures of the developing embryo do not fuse completely during the first trimester of pregnancy. The cleft may be unilateral (affecting one side, ICD-10: Q36.0 for right, Q36.1 for left) or bilateral (affecting both sides), and can range from a small notch in the lip to a complete separation extending into the base of the nose. Unlike syndromic forms, isolated cleft lip occurs without other associated congenital anomalies or intellectual disability. The condition primarily affects the orofacial structures and can lead to difficulties with feeding in newborns, dental development abnormalities, and speech articulation challenges. Psychosocial impacts related to facial appearance may also be significant. The etiology of isolated cleft lip is considered multifactorial, involving a complex interplay of genetic susceptibility factors (including variants in genes such as IRF6, VAX1, and regions on chromosomes 1, 2, and 8) and environmental risk factors such as maternal smoking, alcohol use, folate deficiency, and certain medications during pregnancy. Treatment is primarily surgical, with cleft lip repair (cheiloplasty) typically performed within the first few months of life, often around 3 to 6 months of age. A multidisciplinary team approach is standard, involving plastic or craniofacial surgeons, pediatricians, speech-language pathologists, orthodontists, and psychologists. Additional surgeries may be needed as the child grows to improve lip appearance and function. Nasoalveolar molding (NAM) may be used preoperatively to reduce the severity of the cleft. With appropriate surgical intervention and supportive care, outcomes are generally excellent, and most individuals achieve good functional and aesthetic results.

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