Fig. 1
From: Imaging of COVID-19-associated rhino-orbital-cerebral mucormycosis: imaging analysis of 120 patients
Sinu-nasal mucormycosis with extension into retroantral fat, pterygoid muscle, and orbit. Axial T1-weighted image (A) shows hypointense mucosal thickening of the walls of bilateral maxillary sinuses (white stars) with the erosion of posterior wall of right maxillary sinus (curved arrow). Axial T2-weighted fat-saturated image (B) shows a well-defined hypointense lesion in right retroantral region (curved arrow) with central hyperintensity. Mucosal thickening appears hyperintense (white stars). Axial contrast-enhanced fat-saturated T1-weighted image (C) shows peripheral enhancement of the sinus mucosa (straight long arrow) and right retroantral lesion (curved arrow). Note the involvement of the right pterygoid muscle (straight short arrow) which appears bulky and shows heterogeneous enhancement. Coronal contrast-enhanced fat-saturated T1-weighted image (D) shows a peripheral enhancing lesion in the right orbit with central non-enhancing area (straight long arrow) suggesting intraorbital abscess formation. Part of the right inferior turbinate (straight short arrow) shows no enhancement (the “Black turbinate sign”)