Violation
Mucosal thickening in the maxillary sinus 1. may fill the entire air space of the sinus. 2. is often usually an incidental radiographic finding. 3. may be caused by a periapical infection. 4. may be associated with nasal discharge.
All of the above.
(1) (2) (3)
(4) only
(2) and (4)
(1) and (3)