Cellular pattern and orbital fat involvement are possible risk factors for the failure of corticosteroids in patients with pure idiopathic orbital inflammation syndrome: lessons from the French prospective

To better characterise the effects of corticosteroids on the course of pure idiopathic orbital inflammation syndrome (pIOIS). This was a national, multicentre, prospective, non-interventional cohort study ( Of the 17 patients with pIOIS included in the final analysis, two-thirds received corticosteroids only. DSDP (mg/kg-day) were significantly higher at the time of failure in eight patients (47%) than in nine (53%) remitting at M24 (0.16 vs 0.045; p: 0.03). Notably, patients with pIOIS with a cellular pattern or orbital fat involvement tended to receive higher daily corticosteroid doses in the event of failure than remission (0.16 vs 0.045 and 0.12 vs 0.042, respectively). During treatment, maximal DSDP was 0.52 in failed patients. The highest corticosteroid doses were insufficient to prevent failure in patients with pIOIS, particularly in those with a cellular pattern or orbital fat involvement. Large-scale interventional studies are now necessary to clarify prognostic factors and optimise corticosteroid management in patients with pIOIS.

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Competing interests: None declared.