<unk>  is a malfunction of a<unk>  mechanism which is responsible for directing the transmission of sound energy and air pressure in both the oral cavity and the nasal cavity. When this mechanism is impaired in some way, the valve does not fully close, and a condition known as<unk> ' can develop. VPI can either be congenital or acquired later in life.
Velopharyngeal inadequacy
Velopharyngeal insufficiency
Congenital cartilaginous rest of the neck
Patulous Eustachian tube
Nasal septum deviation
Salivary gland hypoplasia
Persistent thyroglossal duct
Esophageal motility disorder