Bacillary Layer Detachment Due to Macular Neovascularization.

2021
Purpose To describe the clinical and multimodal imaging (MMI) features of bacillary layer detachment (BD), and its response to intravitreal anti-vascular endothelial growth factor (anti-VEGF) therapy, in eyes with macular neovascularization (MNV). Design Retrospective, observational case series. Methods Fourteen eyes (14 patients, 7 male) were imaged with spectral-domain optical coherence tomography (OCT), and either fluorescein angiography or OCT angiography. Therapeutic response was monitored with serial imaging and best-corrected visual acuity (BCVA) assessments. Results Mean age was 75±13 (range: 45-96) years, with mean follow-up duration of 27±21 (range: 1-56) months. Neovascular age-related macular degeneration (nAMD) was found in 71% (10/14) eyes. Type 2 MNV lesions were associated with BD in all 14 eyes. Subretinal hemorrhage was noted in 79% (11/14) eyes. BD promptly resolved following intravitreal anti-VEGF therapy in all eyes. Baseline BCVA improved from LogMar 0.84±0.32 (Snellen equivalent 20/138) to LogMar 0.48±0.31 (Snellen equivalent 20/60) at last follow-up, with treatment of the MNV. Conclusions Type 2 MNV and subretinal hemorrhage are associated with BDs, which may be due to a rapid influx of exudative fluid into the potential space between the external limiting membrane and ellipsoid zone. Intravitreal anti-VEGF therapy results in rapid resolution of BDs and visual improvement in most eyes.
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