Haller’s cells (infraorbital ethmoid cells)

• Haller’s cells, also known as infraorbital ethmoid cells are located at the medial roof of the maxillary sinus in the inferior most portion of the lamina papyracea
• It is related to the orbital floor

Clinical significance:

• It is closely related to the infundibulum and may compromise the ostium of the maxillary sinus
• Hence it is a proposed cause of recurrent maxillary sinusitis

Reference:
Otorhinolaryngology, Head and Neck Surgery By Matti Anniko, Manuel Bernal-Sprekelsen, Patrick Bradley