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Figure 3a. Acute invasive fungal sinusitis in a 39-year-old woman with diabetic ketoacidosis and acute left eye pain. (a) Axial unenhanced CT scan shows sinus disease in the ethmoid, maxillary, and sphenoid sinuses. Note the left-sided facial swelling. (b) Axial contrast-enhanced CT scan shows lack of enhancement in the left cavernous sinus (arrows) secondary to thrombosis from invasive fungal sinusitis. (c) Axial CT scan obtained craniad to b shows proptosis and periorbital inflammatory soft-tissue thickening on the left side (arrow).