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Fig. 6 | BMC Ophthalmology

Fig. 6

From: Grading of macular perfusion in retinal vein occlusion using en-face swept-source optical coherence tomography angiography: a retrospective observational case series

Fig. 6

Right eye of a 48-year old male patient with longstanding inferior major BRVO. a. Color fundus photo showing the pathological arterio-venous crossing (black arrow). Note the collateral vessels that have developed on the optic nerve head (white arrow) reminiscent of chronic course. b. Corresponding SS-OCT radial scan shows multiple hyporeflective cystic space in the inferior para-foveal area. The outer retinal layers are preserved. c, f. Corresponding en-face SS-OCTA images in a 6 × 6 mm field of the SCP and the DCP, respectively. The SCP demonstrates mild ischemic changes in the form of flow-voids mainly located in the inferior quadrants Q3 and Q4. The inferior portion of the perifoveal capillary arcade is rarified (white arrow). The DCP shows flow-voids (asterisk) and compensatory telangiectasia (white arrow) in the inferior quadrants Q3 and Q4. The perifoveal capillary arcade shows pruning, and capillary loss. The FAZ is enlarged and cystoid changes are seen in the fovea. Note that the ischemic changes are more pronounced than those appreciated by examining the SCP image. d, g. En-face SS-OCTA images of the SCP and the DCP displayed in 3 × 3 mm field for higher definition. e, h. En-face SS-OCT images at the planes of the SCP and the DCP respectively, in a 3 × 3 mm field. Note that the entire extent of cystoid spaces is best revealed at the DCP plane

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