Abstract
Background: Churg-Strauss syndrome (CSS) is a rare systemic necrotizing vasculitis of unknown etiology that affects small-to-medium-sized vessels. A multisystem disease that mostly affects the lungs and the skin. In addition, it could affect the renal, cardiovascular, gastrointestinal, central, and peripheral nervous systems. Ocular involvement in the CSS is rare. The reported ocular manifestations include corneal ulcer, uveoscleritis, conjunctival granuloma, orbital inflammatory pseudotumor, amaurosis fugax, retinal artery occlusion, ischemic optic neuropathy, oculomotor nerve palsy, and trochlear nerve palsy.
Case Presentation: A 53-year-old man was admitted with sudden visual loss. CSS was diagnosed earlier, based on asthma, eosinophilia, peripheral neuropathy symptoms, and pulmonary infiltrates. His vision was completely lost in the left eye. Unilateral central retinal artery occlusion (CRAO) was observed by fluorescence angiography.
Results: The treatment modality used in our patient was steroid pulse therapy, and his vision improved 24 hours later. This outcome might emphasize the importance of steroid pulse therapy since it may be effective for CRAO in CSS patients.
Conclusion: This case report described a CSS patient with associated CRAO, in whom steroid pulse therapy improved his visual acuity. Therefore, since intensive treatment should be administered as early as possible to improve the prognosis of vision, rheumatologists should be aware of the presence of CSS-associated CRAO, and they should refer those patients to ophthalmology as soon as possible.

Key words: Churg-Strauss syndrome (CSS), central retinal artery occlusion (CRAO)