Onodi cells are seen in?
**Core Concept**
The Onodi cells are a specific type of air cell located in the sphenoid sinus, which is a paranasal sinus. These cells are significant in the context of endoscopic sinus surgery and neurosurgery, as they may contain the optic nerve or the internal carotid artery.
**Why the Correct Answer is Right**
Onodi cells are a subgroup of posterior ethmoid cells that extend posteriorly into the sphenoid sinus. They are characterized by their proximity to the sphenoid sinus and their potential to extend into the sphenoid sinus. The Onodi cells are significant because they can cause complications during endoscopic sinus surgery if not identified. The cells may contain the optic nerve or the internal carotid artery, which can be damaged during surgical procedures.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Onodi cells are not typically associated with the maxillary sinus, which is a different paranasal sinus.
**Option B:** This option is incorrect because while Onodi cells can extend into the sphenoid sinus, they are not typically associated with the frontal sinus.
**Option C:** This option is incorrect because Onodi cells are not typically associated with the anterior ethmoid cells, which are a different subgroup of ethmoid cells.
**Clinical Pearl / High-Yield Fact**
When performing endoscopic sinus surgery, it is essential to identify Onodi cells and their relationship to the optic nerve and internal carotid artery to avoid complications.
**Correct Answer: C. Onodi cells are typically seen in the posterior ethmoid cells.**