During dacryocystorhinostomy (DCR), a bony ostium is created between the lacrimal sac fossa and the middle meatal space. Which bone is removed to create this opening?

• A Lacrimal bone and frontal process of maxilla
• B Ethmoid bone and lacrimal bone
• C Nasal bone and ethmoid bone
• D Frontal process of maxilla and lacrimal bone ✓

Explanation

In DCR, the bony lacrimal sac fossa is opened into the middle meatus. The lacrimal sac fossa is bounded anteriorly by the frontal process of the maxilla and posteriorly by the lacrimal bone. Removal of these two bones creates the ostium. The ethmoid air cells lie posterior and are not the primary bones removed. The nasal bone forms the bridge of the nose and is not part of this dissection.

Reference: Smith and Nesi's Ophthalmic Plastic and Reconstructive Surgery, 3rd ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.