Figure 5a. Acute invasive zygomycosis in a 59-year-old man. (a) Axial unenhanced CT scan shows increased attenuation in the right anterior and posterior ethmoid air cells and right sphenoid sinus with soft-tissue thickening in the orbital apex (arrow). (b) Coronal unenhanced CT scan shows destruction of the medial wall and floor of the right orbit and disease extension into the orbit (arrows). (c) Axial unenhanced CT scan obtained caudad to a shows destruction of the posterior wall of the right maxillary sinus and obliteration of the periantral fat plane immediately posterior to the sinus (arrows).