Haller cells are seen in?
The Onodi and Haller cells are ethmoidal air cells. Some air cells may invade the orbital floor. These are known as the Haller' cells. The Onodi cell is usually regarded as the most posterior ethmoid cell that pneumatizes lateral and superior to the sphenoid sinus and is intimately associated with the optic nerve.
Roof of nose
Orbital floor
Lateral nasal wall
Maxillary sinus