Characterization of Retinal Microvascular Abnormalities in Birdshot Chorioretinopathy Using OCT Angiography

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Vascular Diseases

Background:

• Birdshot chorioretinopathy (BCR) is a posterior uveitis affecting the retina.
• Understanding retinal microvascular changes in BCR is crucial for disease management.

Purpose of the Study:

• To characterize retinal microvascular changes in BCR using Optical Coherence Tomography Angiography (OCTA).
• To assess the correlation between microvascular alterations and disease progression.

Main Methods:

• Retrospective analysis of OCTA images from 53 eyes with BCR and 110 control eyes.
• Assessment of superficial capillary plexus (SCP) and deep capillary plexus (DCP) for microvascular abnormalities.
• Measurement of vessel density (VD) and foveal avascular zone (FAZ) area, with longitudinal analysis in a subset of patients.

Main Results:

• BCR eyes exhibited reduced whole-image and extra-foveal VD in both SCP and DCP compared to controls (P < 0.0001).
• Enlarged FAZ area was observed in the DCP of BCR eyes (P = 0.0008).
• Decreased VD correlated with worsening visual acuity and was associated with disease duration, age, and treatment status.

Conclusions:

• Reduced retinal microvascular density is a significant finding in BCR.
• Quantifying VD may serve as a valuable biomarker for monitoring BCR severity and progression.
• Further longitudinal studies are needed to confirm the utility of VD in tracking disease and treatment response.