Oblique facial cleft

Oblique facial cleft, also known as meloschisis or lateral facial cleft, is a rare congenital craniofacial malformation characterized by a cleft that extends from the upper lip toward the eye (orbit) along an oblique trajectory across the face. These clefts follow specific anatomical pathways classified by the Tessier numbering system (typically Tessier clefts 3, 4, and 5), which describes the location of the cleft relative to facial landmarks. The condition results from failure of fusion of the embryonic facial processes during early fetal development, typically between the 4th and 8th weeks of gestation. Oblique facial clefts can involve soft tissue alone or extend through underlying bone, affecting the maxilla, orbital floor, and surrounding structures. Clinical features vary depending on the severity and exact location of the cleft but commonly include a visible groove or fissure extending from the lip or nose toward the lower eyelid or medial orbit, coloboma (notching) of the lower eyelid or alar region of the nose, nasolacrimal duct obstruction, and orbital dystopia. The cleft may be unilateral or bilateral and can be associated with other craniofacial anomalies. Affected individuals may experience difficulties with feeding, speech, vision, and breathing depending on the extent of the malformation. The condition can also have significant psychosocial impact due to facial disfigurement. Treatment is primarily surgical and typically requires a multidisciplinary approach involving craniofacial surgeons, ophthalmologists, otolaryngologists, speech therapists, and orthodontists. Surgical repair is usually staged over multiple procedures during childhood, aiming to reconstruct soft tissue and bony defects, restore facial symmetry, and optimize functional outcomes including feeding, speech, and eye protection. The etiology is generally considered multifactorial, though some cases may be associated with amniotic band syndrome or chromosomal abnormalities. Early diagnosis, often possible prenatally via ultrasound, allows for coordinated care planning.

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