An additional challenge for head and neck radiologists: anatomic variants posing a surgical risk – a pictorial review

摘要

Onodi cell. Coronal ( ) and axial ( ) MDCT images show a large air-cell (asterisk) along the superolateral aspect of the right sphenoid sinus (ss), corresponding to an Onodi cell. Pneumatization extends to the anterior clinoid process; consequently, the optic nerve canal protrudes slightly within the Onodi cell (arrowhead)