## **Core Concept**
Dacryocystorhinostomy (DCR) is a surgical procedure used to treat nasolacrimal duct obstruction by creating a new passage for tear drainage. The surgery involves making an opening into the nasal cavity to bypass the blocked duct. The procedure aims to restore normal tear drainage from the eye into the nasal cavity.

## **Why the Correct Answer is Right**
The correct answer involves making an opening into the **inferior meatus** of the nasal cavity. During DCR, the surgeon creates a direct communication between the lacrimal sac and the nasal cavity, specifically into the inferior meatus. This allows tears to drain directly from the lacrimal sac into the nasal cavity, bypassing the obstructed nasolacrimal duct.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The superior meatus is involved in the drainage of posterior ethmoidal cells and the sphenoid sinus, not directly related to the DCR procedure.
- **Option B:** The middle meatus is a critical area for drainage of anterior ethmoidal cells, frontal sinus, anterior ethmoid air cells, and maxillary sinus (via the semilunar hiatus), but it's not the site for DCR.
- **Option C:** This option is actually the correct location and thus not incorrect but rather redundant in this context.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the success of DCR depends on the accurate placement of the opening into the inferior meatus and ensuring that the newly created passage remains patent. The procedure can be performed endoscopically or through an external approach.

## **Correct Answer:** . Inferior meatus