MRI
MRI brain with and without contrast demonstrates a 3.2 x 2.8 x 2.3 cm, lobular, heterogeneously enhancing mass in the anterior right ethmoid sinus and nasal cavity. The mass exhibits intermediate T1 and T2 signals and marked diffusion restriction (ADC lower than that of the brain).
There is invasion through the right medial orbital wall into the extraconal space with lateral deviation of the medial rectus muscle and abutment of the superior oblique muscle. The mass also invades the right frontal sinus with secondary right frontal sinus mucosal thickening. The mass obstructs the right ostiomeatal complex, resulting in mucosal thickening in the right maxillary and posterior right ethmoid sinuses.