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要約 目的:外眼筋炎により眼球後退症を呈した2症例の報告。症例:1例は55歳女性で,1か月前から複視と頭痛があった。右眼に強い内転障害があり,内転時に眼球が後退し,瞼裂が縮小した。CTで右眼の外直筋に強い肥厚があり,外直筋炎と診断した。ステロイド薬内服で1か月後に内転障害が改善し,眼位が正常化した。他の1例は77歳女性で,3か月前からの霧視と側方視の際に圧迫感があった。右眼に外転と内転制限があり,外転時に眼球が後退し,瞼裂が縮小した。CTで右眼の内直筋に肥厚があり,内直筋炎と診断した。筋炎が強く,ステロイド薬の内服で2年後に外転障害,眼球後退と瞼裂縮小が改善した。結論:眼球後退症が後天性の外筋炎で発症することがある。
Abstract. Purpose:To report two cases of retraction syndrome secondary to extraocular myositis. Cases:A 55-year-old female presented with diplopia and headache since one month before. Her right eye showed obviously restricted adduction with retraction and narrowing of palpebral fissure on attempted adduction. Computed tomography(CT)showed thickening of lateral rectus muscle,leading to the diagnosis of orbital myositis. Another 77-year-old female presented with blurring of vision and feeling of pressure on lateral gaze since 3 months before. Her right eye showed limitation in abduction and adduction with eyeglobe retraction and narrowing of palpebral fissure on attempted lateral gaze. CT showed thickened medial rectus muscle of her right eye,leading to the diagnosis of myositis. It took 2 years of systemic corticosteroid treatment before improvement of clinical manifestations. Conclusion:These cases illustrate that retraction syndrome may be due to extraocular myositis.
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