CT
Axial non-contrast
Axial bone window
Axial C+ arterial phase
Coronal bone window
Coronal C+ arterial phase
Sagittal C+ arterial phase
Multiplanar CT images, showing a hypodense lesion in the right ethmoid sinus with internal calcification and with remodelling 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.