Sinusitis
Normal sinusseries
Frontal sinuses& the ethmoid aircells are visualized while the petrous bones hide the maxillary antra.
b) Semi-axial projection(Water's view)
Both maxillary antra are well depicted and the orbital floor with the infraorbital canal (black arrow) is separated from the orbital rim (open arrow). The sphenoid compartments can be seen through the open mouth (white arrow).
c) Lateral projection
A well developed sphenoid sinus can be seen extending back under the pituitary fossa. The posterior walls of the frontal and the maxillary sinuses can also be outlined (arrows).
d) Axial projection
The posterio-lateral walls of the maxillary antraform a smooth s-shaped curve (black arrow) while the lateral walls of the orbits form a straight line (open arrow). The depth and posterior wall of frontal sinuses can also be visualized (asterisk).