+Differences between OAC and<unk>  OAC<unk>  Connection between oral cavity and antrum that is not epithelialised. Connection between oral cavity and antrum that has epithelialised. May develop immediately following the extraction of maxillary tooth that is close to antral floor. Develops from OAC that has not healed spontaneously, has not been closed surgically, or initial attempts at surgical closure have failed. Requires surgical closure if large to prevent development of a persistent<unk>  and chronic sinusitis. Requires surgical treatment to remove and close the<unk> .
Oroantral fistula
Liber pantegni
Omphalocele
Urachal fistula
Cimino fistula
Midline cervical cleft
Hypospadias
Iatrosophia