A<unk>  is a usually benign medical condition in which the thyroglossal<unk> , a structure usually only found during embryonic development, fails to atrophy. The<unk>  persists as a midline structure connecting the back of the tongue to the thyroid gland.
Persistent thyroglossal duct
Thyroglossal cyst
Branchial cleft cyst
Congenital diaphragmatic hernia
Velopharyngeal inadequacy
Thyroglossal duct
Esophageal atresia
Ablepharon macrostomia syndrome