Best view for frontal sinus:
Caldwell view: (a) Frontal sinuses (seen best). (b) Ethmoid sinuses. (c) Maxillary sinuses. (d) Frontal process of zygoma and zygomatic process of frontal bone. (e) Superior margin of orbit and lamina papyracea. (f) Superior orbital fissure. (g) Foramen rotundum (inferolateral to superior orbital fissure). Ref: Dhingra 7e pg 494.
caldwell
Towne
Walter's
Lateral view
Nose and paranasal sinuses