There is thickening of the walls (seen as a thin line of low SI) of the right maxillary sinus, mild circumferential mucosal thickening, and complete opacification (with the contents partially low signal intensity, suggestive of fungal infection and/or dessication), with these findings all seen on the T2-weighted scan and consistent with chronic sinusitis. The subsequent DWI and ADC map reveal restricted diffusion within the fluid therein, suggestive of ongoing infection.

Part of the on-line supplement to Neuroradiology – The Essentials with MR and CT (© 2015)