経過中に網膜静脈分枝閉塞症を発症した視神経乳頭上動脈瘤の1例

A case of macroaneurysm on the optic disc followed by branch retinal vein occlusion

要約　目的：乳頭上の網膜細動脈瘤に網膜静脈分枝閉塞症が併発した症例の報告。症例：69歳女性がSjögren症候群として内科から紹介され，経過観察中であった。初診時の矯正視力は右0.9，左0.5であった。2年後に右眼の乳頭上に動脈血管瘤が発見された。動脈血管瘤は緩慢に増大し，9か月後に硝子体出血を伴う網膜静脈分枝閉塞症が生じた。網膜出血と黄斑浮腫が生じ，視力が0.3に低下した。発見から15か月後に硝子体手術を行い，動脈瘤は器質化し，0.7の最終視力を得た。結論：本症は，乳頭面上に生じた網膜細動脈瘤では網膜静脈分枝閉塞症が併発する可能性があることを示している。

Abstract.　Purpose：To report a case of arterial macroaneurysm on the optic disc followed by branch retinal vein occlusion. Case：A 69-year-old woman was diagnosed with Sjögren syndrome with systemic manifestations. Corrected visual acuity was 0.9 right and 0.5 left. Her right eye developed arterial macroaneurysm on the optic disc 2 years later. The aneurysm gradually enlarged followed by branch retinal vein occlusion and vitreous hemorrhage 9 months later. Vitreous surgery was performed another 6 months later when visual acuity decreased to 0.3 due to retinal hemorrhage and macular edema. Surgery was followed by closure of macroaneurysm with final visual acuity of 0.7. Conclusion：The present case illustrates that arterial macroaneurysm on the optic disc may be followed by branch retinal vein occlusion.