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Figure 3. Radiological aspect of chronic rhinosinusitis, anterior septal perforation (asterisks), and maxillary sinus osteitis (arrowhead) in a patient diagnosed with granulomatosis with polyangiitis [CT scan, axial (A) and frontal (B) views]. T2-weighted MRI axial scan (C) and fluid attenuated inversion recovery (FLAIR) coronal scan (D) showing diffuse hyperintense opacification of the middle ear and mastoid cells in bilateral mastoiditis (asterisks).