Purpose: To describe changes in three-dimensional choroidal volume and thickness with full raster scans of enhanced depth imaging optical coherence tomography in patients with birdshot retinochoroidopathy.
Methods: This prospective case series collected spectral domain optical coherence tomography images with the enhanced depth imaging technique from eight eyes of eight patients with birdshot retinochoroidopathy including four active patients (four eyes) and four quiet patients (four eyes). Fifty scans of each patient were manually segmented before automated built-in calibration software was used.
Results: Of all active patients, there were no statistically significant differences in the total choroidal volume and mean central choroidal thickness between the active and inactive phase over 6 months of follow-up. Alterations in choroidal parameters were evident and consistent after amelioration of inflammation, whereas the retinal volume and thickness remained stable. Regarding the eight inactive eyes at 6 months, the mean total choroidal volume and mean central choroidal thickness were significantly less than historical controls (P = 0.03 and P < 0.001, respectively). Persistent suprachoroidal hyporeflective space in two patients was noted despite the fact that clinical inflammation completely subsided at 6 months.
Conclusion: Choroidal volume and thickness changes were consistent with inflammation in patients with birdshot retinochoroidopathy. Patients with inactive birdshot retinochoroidopathy have significant reduction in choroidal volume and thickness than do normal patients.
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