Perforation with a submucosal cleft palate (SMCP) is a rare condition with a limited number of cases reported in the literature. However, most described cases include neonates and infants, but not cases due to trauma or infection. Here, we present a case of an adult patient with SMCP with a perforation of the palate who was undiagnosed. In light of this case, diagnosis and treatment of perforation in SMCP are presented. A new diagram that can be used in the management of these patients with velopharyngeal insufficiency is proposed.