Table 1.

REBOVasC MRI checklist for structured reporting of CAM

Structure	Abnormalities
Rhinosinus	T2 heterogenous mucosal thickening, turbinate/mucosal nonenhancement, fluid collections
Extrasinus	Facial subcutaneous soft tissue, pteryopalatine fossa, masticator spaces
Bone	Sinus walls, pterygoid processes, alveolar processes, sinus bordering orbit walls, skull base – destruction, subperiosteal abscesses
Orbital	Preseptal, postseptal inflammatory changes, optic nerve involvement (infarction, perineuritis), apex soft tissue, EOM nonenhancement, Globe
Vascular	Arterial: ICA steno-occlusion, ophthalmic artery occlusion, ECA occlusion, mycotic aneurysms
	Venous: Cavernous sinus – Direct invasion vs thrombosis/thrombophlebitis, Superior ophthalmic vein thrombosis
CNS	Ischemic changes – sterile infarcts (usually watershed, less commonly territorial), infarcts with secondary fungal invasion
	Direct invasion – abscesses/granulomas, meningitis, perineural spread via trigeminal nerve, contiguous brainstem involvement

EOM – Extraocular muscle, CNS – Central Nervous System