A patient with branch retinal vein occlusion accompanied by superior ophthalmic vein thrombosis due to severe superior ophthalmic vein enlargement in a patient with graves ophthalmopathy.

We report a patient with branch retinal vein occlusion (BRVO) accompanied by superior ophthalmic vein (SOV) thrombosis resulting from severe SOV enlargement in a patient with Graves ophthalmopathy (GO). A 78-year-old woman diagnosed with BRVO presented with reduced vision. She had a more than 20-year history of unilateral GO.