Table 1.

Computed tomography severity scoring index

Items	Value
Disease limited to nose/PNS
Mucosal disease in paranasal sinuses	1
Mucosal disease in nasal cavity and nasopharynx	1
Adjacent tissue invasion
Hard palate erosion	1
Soft tissue infiltration anterior/posterior periantral fat	1
Soft tissue infiltration extending to PPF/SOF/IOF/Orbital apex/ITF	2
Significant bilateral disease	2
Orbit
Soft tissue/fat/muscle/NLD involvement	1
Bone erosion	2
Intraocular/optic nerve involvement	3
Intracranial disease
Skull base invasion (erosion)	2
Cavernous sinus involvement	3
Internal carotid artery narrowing/occlusion	3
Intracranial complications (meningitis/cerebritis/abscess/infarct)	3

Mild: 1-8; Moderate: 9-16; Severe: 17-25. PNS: Paranasal sinuses; PPF: Pterygopalatine fossa; SOF: Superior orbital fissure; IOF: Inferior orbital fissure; ITF: Infratemporal fossa; NLD: Nasolacrimal duct.