• A child had complete mandibular agenesis, with associated anomalies of microstomia, left choanal stenosis, and a cleft soft palate. This child had evidence of disruption in development at about the four-week stage by the persistence of several developmental remnants, specifically, the buccopharyngeal membrane, tongue remnants, and the laryngotracheal groove. The etiology of this condition is unclear at this time.
(Arch Otolaryngol 1985;111:132-134)