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Clinical Problem Solving: Radiology
May 2002

Diagnosis Radiology Quiz Case 1

Author Affiliations


Arch Otolaryngol Head Neck Surg. 2002;128(5):598-599. doi:

Adolf Onodi,1 a professor of laryngology at the University of Budapest, in Hungary, first described the Onodi (sphenoethmoid) cell in 1903. In his original article, he did not describe a single "cell" but instead presented 38 variations of posterior ethmoid anatomy, which he characterized into 12 groups. He explained that the "most posterior ethmoid cell" could pneumatize lateral or superolateral to the sphenoid sinus, thus allowing for an anatomical variation in which the sphenoid sinus could lie inferior and medial to the posterior ethmoid cell.2 This position is different from the expected location of the sphenoid sinus, which is most commonly directly posterior to the most posterior ethmoid cell.

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