<unk>  <unk>  is an epithelialised<unk>  communication (OAC). OAC refers to an abnormal connection between the oral cavity and antrum (or maxillary sinus). The creation of an OAC is most commonly due to the extraction of a maxillary (upper) tooth (typically a maxillary first molar) closely related to the antral floor (floor of the maxillary sinus). A small OAC (up to 5mm wide) may heal spontaneously but a larger OAC would require surgical closure to prevent the development of persistent<unk>  and chronic sinusitis.
Oroantral fistula
Liber pantegni
Omphalocele
Urachal fistula
Cimino fistula
Midline cervical cleft
Hypospadias
Iatrosophia