SD-OCTが診断に有用であった小乳頭に伴う傍乳頭網膜分離症の1例

Spectral domain optical coherence tomograph was useful in the diagnosis in a case of peripapillary retinoschisis with small optic disc

要約　目的：小乳頭に伴う傍乳頭網膜分離症の症例報告。症例：数か月前からの左眼視力低下を主訴に受診した67歳男性。矯正視力は右（1.2），左（0.7）。両眼ともに乳頭小窩を認めず，小乳頭だった。左眼黄斑部に車軸状の反射があり，スペクトラルドメイン光干渉断層計（SD-OCT）像では，左眼乳頭上膜と乳頭内の空隙から連続する網膜分離を認めた。結論：小乳頭に傍乳頭網膜分離を合併することがある。乳頭部を含めた複数方向のSD-OCTが診断に有用であり，分離の起始部を推測できた。

Abstract.　Purpose：To report a case of peripapillary retinoschisis in one eye with small optic disc in both eyes. Case：A 67-year-old male presented with impaired vision in the left eye since a few months before. Findings：Visual acuity was 1.2 right and 0.7 left when corrected by －3.75 and －4.75 diopters respectively. Both eyes showed small optic disc. Pit of the optic disc was absent. The left macula showed reflex simulating wheel spoke. Spectral domain optical coherence tomography（SD-OCT）showed retinoschisis continuous with epipapillary membrane and the intrapapillary cavity in the left eye. Conclusion：This case illustrates that peripapillary retinoschisis may be present in an eye with small optic disc. SD-OCT in multiple directions was useful in the diagnosis and in identifying the origin of retinoschisis.