Table 2.

Proposed 3-Tier Staging of ROCM

Stage 1: Sinonasal involvement	1A: Involvement of 1 sinus and ipsilateral middle turbinate.
	1B: Involvement of >1 ipsilateral sinus and/or turbinate.
	1C: Involvement of bilateral sinonasal cavities.
Stage 2: Orbital involvement	2A: Involvement of medial and/or inferior orbital compartment only.
	2B: Diffuse unilateral orbital involvement with or without optic nerve, nasolacrimal duct, and vascular involvement.
	2C: Bilateral orbital involvement.
Stage 3: Central nervous system involvement	3A: Involvement of pachymeninges, cribriform plate, cavernous sinus/Meckel’s cave.
	3B: Vascular involvement (infarct/bleed)/perineural spread and skull base involvement.
	3C: Leptomeningitis, cerebritis or abscess formation - focal or diffuse involvement.

ROCM, rhino-orbital-cerebral mucormycosis.