Abstract
BackgroundTo draw comparisons between spectral domain optic coherence tomography (SD-OCT) features of subretinal silicon oil (SO), perfluoro-n-octane (PFO) or C3F8 gas.MethodsCases diagnosed with retained subretinal vitreous substitutes (VS) were retrospectively selected. Demographic data were collected and OCT features were analyzed.ResultsIn the 13 cases with subretinal PFO, hyper-reflectivity under the bubble was noted in 8 eyes (61.5%); choroidal shadow at the borders of the bubble in 11 eyes (84.6%); hyper-reflective halo around the bubble in 5 eyes (38.4%) and a hyper-reflective apical dot in 8 eyes (61.5%).The two cases with multiple PFO bubbles had complete septum dividing the bubbles. The one case with subretinal SO had hyper reflectivity under the bubble; no choroidal shadow at the edge of the bubble; hyper-reflective halo was noted around the bubble and the apical hyper-reflective dot was present; there was no complete septum dividing multiple bubbles. The single case with subretinal C3F8 had some bubbles with totally round base, incomplete septum, hyper reflectivity under the bubble, choroidal shadow at the edge of the bubble, a hyper-reflective halo and an apical dot.ConclusionDifferent subretinal VS share similar SD-OCT characteristics. Round base bubbles are only observed with subretinal C3F8 gas, while incomplete septum are related to retained subretinal SO or gas.
Highlights
To draw comparisons between spectral domain optic coherence tomography (SD-OCT) features of subretinal silicon oil (SO), perfluoro-n-octane (PFO) or C3F8 gas
All patients were submitted to 23-gauge vitrectomy for rhegmatogenous retinal detachment repair
In the 13 cases with subretinal PFO, the hyper-reflectivity under the bubble was noted in 8 eyes (61.5%); shadow in the choroid at the borders of the vitreous substitutes (VS) bubble was noted in 11 eyes (84.6%); a hyperreflective halo around the VS bubble was present in 5 eyes (38.4%) and a hyper-reflective apical dot in 8 eyes (61.5%)
Summary
To draw comparisons between spectral domain optic coherence tomography (SD-OCT) features of subretinal silicon oil (SO), perfluoro-n-octane (PFO) or C3F8 gas. Perfluoro-n-octane liquid (PFO) is widely used in vitreoretinal surgery for retinal detachment (RD) repair due to its specific characteristics, that include high density, low surface tension, low viscosity and optical clarity [1]. One possible complication of PFO use is its migration to the subretinal space, which may lead to retinal structural and functional changes [2,3,4]. Multiple reports have described spectral-domain optical coherence tomography (SD-OCT) features of emulsified subretinal SO [6, 7], but SD-OCT features of non-emulsified subretinal SO, to the best of our knowledge, are yet to be described. Subretinal gas migration has already been described [8], but not its SDOCT features. SD-OCT aspects of retained subretinal PFO have been described and help distinguish PFO from residual subretinal fluid, macular cysts or cystoid macular edema [9, 10], Zacharias et al Int J Retin Vitr (2020) 6:53 but no attempts have been made in literature to distinguish between subretinal retained PFO, SO or gas
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