What are displaced sphenoethmoid air cells called?

Displaced sphenoethmoid air cells are referred to as Onodi cells. These are a specific variation of ethmoid cells that can expand and become associated with the posterior ethmoid region and the sphenoid sinus. The presence of Onodi cells can have clinical importance, particularly in the context of endoscopic sinus surgery, as their displacement or anatomical variations can affect surgical approach and drainage patterns.

Understanding the anatomy surrounding the sphenoid sinus is crucial because the Onodi cells are located in proximity to critical structures such as the optic nerve, making their identification important to avoid complications during surgical procedures. Their relationship to the sphenoid sinus can also contribute to the pathophysiology of chronic sinusitis or other conditions affecting the paranasal sinuses.

In contrast, other terms refer to different anatomical structures or conditions unrelated to displaced sphenoethmoid air cells. Agger nasi cells refer to air cells located anterior to the middle turbinate, while Curschmann's spirals are associated with asthma and represent spiraled mucus casts in bronchioles. Charcot-Leyden crystals are formed from eosinophil breakdown products and are indicative of allergic responses or parasitic infestations, none of which apply to the displacement of sphenoethmoid