Antral pseudocyst — dome-shaped radiopacity on the floor of the maxillary sinus.

Antral pseudocyst An antral pseudocyst is a benign, incidental radiographic finding: a smooth, dome-shaped homogeneous radiopacity on the floor of the maxillary sinus. It is usually asymptomatic and does not require treatment. Cementoblastoma is attached to a tooth root; odontoma contains tooth-like material; ameloblastoma is multilocular and expansile.