Figure 5.

Diffuse large B cell lymphoma. (A) Coronal and (B) axial postcontrast CT images show an isodense soft tissue density-enhancing lesion, involving the right maxillary and ethmoid sinuses and superior nasal cavity with right medial orbital wall and right anterior skull base dehiscence (white arrows). (C) T2W, (D) noncontrast T1W, and (E) postcontrast fat-suppressed T1W images reveal homogenous enhancement of the lesion, which demonstrates isointensity on T1W and hypointensity on T2W images consistent with high cellularity. The lesion extends into the right extraconal orbital compartment and mildly compresses the right medial rectus muscle with a small component of the lesion in the left superior nasal cavity. (F) ADC map image shows a hypointense signal in the lesion consistent with restricted diffusion due to high cellularity.