The right ethmoid sinus is expanded by virtue of a well-defined mass lesion. It measures 4.1 x 4.0 x 4.0 cm along its max axial and CC dimensions. It elicits an intermediate signal on T1 and a predominately low signal on T2 with internal cystic areas. The lesion expands the right ethmoid sinus and extends inferiorly within the roof of the right nasal cavity. It expands the sinus laterally, encroaching upon the right orbital cavity with subsequent proptosis. It bulges intracranially displacing the right frontal lobe superiorly.
Radiological features are suggestive of the right ethmoid sinus ossifying fibroma.