若年男性に発症したacute zonal occult outer retinopathyの1症例

Acute zonal occult outer retinopathy (AZOOR) in a young male

（18-D501-15）　17歳男性が10日前からの右眼視野障害で受診した。視力は両眼とも正常であった。前眼部，中間透光体，眼底は正常所見を呈した。右眼に耳側の視野欠損があり，多局所網膜電図で視野欠損に一致した網膜応答密度が低下していた。螢光眼底造影では造影初期に乳頭周囲の背景螢光の遅延があった。眼球電図では明上昇L／D比率と高浸透圧応答変化率の低下があつた。以上から，acute zonal occultouter retinopathy （AZOOR）と診断した。発症7か月後に，無治療で視野と網膜電図はほぼ正常に回復した。本症例はGassの分類で眼底に異常所見がない1群に属し，網膜色素上皮と脈絡膜に障害がある事例と考えられた。

A 17-year-old male presented with visual field defect in his right eye of 10 days' duration. Visual acuity was normal in both eyes. There were no abnormal findings in the anterior segment, optic media or the fundus. The right eye showed temporal visual field defect. Multifocal electroretinogram (MERG) showed decreased responses in the same area. Fluorescein angiography showed filling delay around the disc. Electrooculogram (EOG) showed decreased light rise and hyperosmolarity response. He was diagnosed as acute zonal occult outer retinopathy (AZOOR). The visual field and MERG findings spontaneously recovered after 7 months. This case was interpreted as belonging to group 1 by Gass manifesting disorders in the retinal pigment epithelium and the choroid.