Extracranial meningioma of the ethmoid sinus
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Multiplanar CT images, showing a hypodense lesion in the right ethmoid sinus with internal calcification and with remodeling of the adjacent bone structures.
Heterogeneous enhancement after contrast injection also is seen.
The mass is causing a pressure effect on the right frontal recess and retention of secretions.
This is a pathologically-proven case of meningioma.