Bilateral Orbital Myositis: A Rare Case Report

Abstract

The orbital idiopathic myositis is included in the group of orbital inflammatory pseudotumors. It’s an isolated inflammation, unspecific of orbital muscles. This pathology is rare in Children and it is a source of real diagnosis problems. We report the case of a 10-year-old boy who was hospitalized for bilateral painful exophthalmos. We report the case of a 10-year-old boy who was hospitalized for bilateral exophthalmos of abrupt onset, painful, axial, and non reducible with complete ophthalmoplegia of both eyes. The examination showed a retained Visual Acuity (VA) of 10/10 with a normal Fundus Examination (FO) in both eyes. The inflammatory and thyroid work-up are negative. The orbital tomodensitometry revealed a grade I exophtalmitis and a thickening of external and inferior muscles. The corticotherapy leaded to the decline of exophtalmitis andnormalization of eye movements after 1 month of treatment. The etiologic survey was negative, then the diagnosis of idiopathic myositis was kept. The orbital idiopathic myositis stills an eliminating diagnosis. Faced to a child’s exophtalmitis, other differential diagnosis must be excluded by an advanced etiologic survey.