Observation of Outer Retinal Tubulation Using En face Optical Coherence Tomography

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  • En face OCTを用いたOuter retinal tubulationの観察

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<p>[Purpose] Outer retinal tubulation(ORT) is a tubular lesion found in the outer retina in patients with retinal diseases such as age-related macular degeneration (AMD). In the present study, we described the en face features of ORT using optical coherence tomography (OCT).</p><p>[Subjects and Methods] Subjects were 15 eyes of 15 AMD patients detected with ORT, who had visited the University of Tokyo Hospital between December 2015 and April 2016. The subjects' en face OCT images of ORT obtained using RTVueXR® (Optovue) were retrospectively reviewed. </p><p>[Results] The en face OCT images showed the presence of ORT in the outer retina with a hyporeflective structure at the internal margins and an ovoid or tubular structure thicker than the retinal blood vessels at the outer margins. The pattern of ORT was classified into two types: diffuse (11 eyes) and branching (4 eyes) types. Subjects with the diffuse and branching types of ORT did not significantly differ in age, visual acuity, or refractive error. The branching type of ORT showed a significantly longer period of presence (means, 57.7 months) than the diffuse type of ORT (31.9 months) (P < 0.05). </p><p>[Conclusions] Using en face OCT images, we could observe ORT and characterize its feature as the branching and diffuse types. The branching type of ORT showed a change in the shape during our observation.</p>

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