图例CT scan with bone algorithm (A) depicts an expanding mass within the nasal fossa, ethmoidal cell, and sphenoid sinus. It produces bone disruption and remodeling (arrows). Right exophtalmos is partially depticted. The mass shwos restricted diffusino on DWI (B) and ADC maps (C). Sagittal T2WI (D) and sagittal (E) and coronal (F) contrast-enhanced T1WI show heterogeneous signal intensity and enhancement of the mass, with a cystic component (arrow). The tumor extends to the intracranial compartment, producing mass effect on the adjacent brain parenchyma.
On CT, ENB tends to be isodense or hyperdense compared to the surrounding soft tissues. There is moderate contrast enhancement. Bone erosion and remodeling are common.
On MRI, tumors may be hypointense on T1WI and isointense or hyperintense (areas of cystic degeneration or hemorrhage) on T2WI. Avid enhancement after the gadolinium administration. Heterogeneous in areas of necrosis.