fig28

Figure 28. Sinonasal lymphoma. (A) Coronal MRI images (from left to right: T2, precontrast T1, and post-contrast T1) show an ill-defined, trans-spatial lesion with intermediate T1/T2 signal intensity and heterogeneous enhancement. The lesion extends along the nasal cavity, maxillary sinus wall, maxillary alveolus, and hard palate, with invasion of the adjacent medial right orbit and extensive stranding of the facial soft tissues (arrows); (B) Axial DWI images demonstrate a hyperintense signal (arrow), confirmed to represent restricted diffusion on the corresponding ADC maps (not shown). MRI: Magnetic resonance imaging; DWI: diffusion-weighted imaging; ADC: apparent diffusion coefficient.