Beyond Velopharyngeal Dysfunction: A Comprehensive Review of Pathology Associated With Submucous Cleft Palate

Submucous cleft palate (SMCP) is a subtle and heterogeneous form of clefting often missed in infancy due to its intact mucosal surface and variable clinical presentation. Although traditionally defined by Calnan triad (bifid uvula, muscular diastasis, and posterior hard palate notch), many cases lack these findings entirely, particularly in occult SMCP. While velopharyngeal dysfunction (VPD) is the most recognized consequence of SMCP, middle ear disease, feeding difficulty, and delayed speech have also been associated with the diagnosis. Attribution of these findings to the anatomic disturbance of SMCP alone is highly confounded if an underlying syndromic diagnosis is present, as the syndromes frequently associated with SMCP often also present with developmental, neurological, and/or craniofacial anomalies that can independently contribute to similar symptomatology. This can have significant management implications and obscure the primary target of therapeutic or surgical decision-making. This review examines the literature on SMCP with particular emphasis on functional sequelae in isolated versus syndromic cases. We specifically evaluate speech, feeding, and otologic outcomes, highlight differences between overt and submucous clefts, and review current evidence regarding surgical indications and timing in both populations.