上方乳頭低形成症例で確認された後極網膜内層厚の菲薄化

Thinning of inner retinal layer in the posterior fundus in eyes with superior segmental optic nerve hypoplasia

要約　背景：上方乳頭低形成は先天性疾患で，眼底上方の網膜神経線維層の欠損と，これに対応する下方の楔状視野欠損が生じる。目的：上方乳頭低形成眼で測定した網膜内層厚の報告。症例：上方乳頭低形成と診断した4例を対象とした。いずれも片眼性で，年齢は54，59，62，63歳である。3例では緑内障が疑われていた。患眼の矯正視力はいずれも1.2で，上方乳頭低形成に相当する視野欠損と，光干渉断層計により後極部の網膜内層に菲薄化があった。結論：上方乳頭低形成の4眼で，後極部の網膜内層に菲薄化があった。眼底の広い範囲に異常がある可能性がある。

Abstract.　Background：Superior segmental optic nerve hypoplasia（SSOH）is a congenital disorder. It is characterized by retinal nerve fiber deficiency in the superior fundus and visual field defect in the inferior sector. Purpose：To report 4 cases of SSOH who showed thinning of inner retinal layer in the posterior fundus. Cases：The 4 cases showed characteristic funduscopic findings of SSOH and corresponding visual field defect. All were unilaterally affected. They were aged 54, 59, 62 and 63 years respectively. Three cases were suspected of glaucoma. Corrected visual acuity in the affected eye was 1.2 in all the 4 cases. Optical coherence tomograph showed thinning of inner retinal layer in the posterior fundus. Conclusion：Attenuation of inner retinal layer was present in the posterior fundus in 4 cases of SSOH. This finding suggests that SSOH may involve a wider area of the fundus than currently assumed.