Median cleft of the upper lip and maxilla

Median cleft of the upper lip and maxilla, also known as midline cleft of the upper lip or median cleft lip, is a rare congenital craniofacial malformation in which a cleft occurs at the midline of the upper lip and may extend into the premaxillary portion of the maxilla (upper jaw). Unlike the more common lateral cleft lip and palate, this condition involves a true midline defect, which distinguishes it embryologically and clinically. It results from a failure of fusion or inadequate development of the medial nasal prominences during early embryonic facial development. The condition primarily affects the face, specifically the upper lip, the premaxilla, and sometimes the nose. Clinical features can range from a minor notch or groove in the midline of the upper lip to a complete cleft extending through the lip and the underlying maxillary bone. Associated features may include a broad or bifid nasal tip, hypertelorism (widely spaced eyes), and in some cases, midline brain anomalies such as those seen in the holoprosencephaly spectrum, depending on the severity and whether the cleft is part of a broader syndrome. Isolated median cleft lip is rare and must be distinguished from syndromic forms that may involve additional midline defects of the brain or other structures. Treatment is primarily surgical and involves reconstructive repair of the lip and, when necessary, the underlying maxillary bone. Surgical correction is typically performed in infancy and may require staged procedures depending on the extent of the defect. A multidisciplinary team including craniofacial surgeons, orthodontists, speech therapists, and geneticists is often involved in long-term management. Genetic counseling is recommended, particularly when the cleft occurs as part of a broader syndrome. Outcomes following surgical repair are generally favorable, though some patients may require additional procedures for optimal cosmetic and functional results.

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