fig19

Figure 19. SNSCC. (A) Coronal CT image of the sinonasal cavity shows a destructive soft-tissue mass centered in the left maxillary antrum with erosion of the sinus wall, nasal cavity, ethmoid complex, orbit, and anterior skull base (arrow); (B) Coronal T2-weighted MRI demonstrates intermediate signal intensity of the tumor and loss of the hypointense zone, indicating dural invasion (arrow); (C) Coronal post-contrast T1-weighted MRI shows nodular tumor extension through the anterior skull base defect with hyperenhancing thickening of the overlying dura (arrow). SNSCC: Sinonasal squamous cell carcinoma; CT: computed tomography; MRI: magnetic resonance imaging.