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Differential diagnosis
| Inflammatory | Idiopathic orbital inflammation |
| Tolosa-Hunt syndrome | |
| Sarcoidosis | |
| Infectious | Extension of bacterial sinusitis |
| Tuberculosis | |
| Histoplasmosis | |
| Coccidiomycosis | |
| Other fungi (Mucor, Fusarium) | |
| Vasculitis | Giant cell arteritis |
| Wegener's arteritis | |
| Neoplastic | B cell lymphoma |
| Primary orbital tumors | |
| Neuro-ophthalmic | Optic neuritis |
