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Fig. 5 | BMC Ophthalmology

Fig. 5

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

Fig. 5

Left eye of a 51-year old male patient with ischemic type of CRVO. a. Color fundus photo and FFA shows the typical blood and thunder appearance of CRVO, with marked optic disc swelling and hyperemia along with macular edema. The lower right color photo represents the same patient after resolution of intra-retinal hemorrhages and optic disc swelling with peri-venous sheathing and CME. b. Corresponding SS-OCT radial scan shows a large intra-retinal hyporeflective sub-foveal space with multiple similar hyporeflective spaces in the para-foveal area indicating CME. DRIL is identified in the 1.00 mm area centered on the fovea by inability to identify the boundaries between retinal layers (white arrow-heads). Note the disrupted inner segment-outer segment (IS/OS) photoreceptors junction (white arrow). c. Corresponding en-face SS-OCTA image of the SCP in a 6 × 6 mm field. Note that the SCP shows only minimal ischemic changes mainly in quadrants Q2 – Q3 in the form of hypointense flow-void areas reminiscent of capillary dropout (white arrow-head), capillary pruning (asterisk) and telangiectasia (white arrow). The FAZ appearance is unremarkable. d, e. Corresponding en-face SS-OCT image and the corresponding flow-density map in a 6 × 6 mm field. f. Corresponding en-face SS-OCTA image of the DCP in a 6 × 6 mm field. Note almost complete wiping-out of the normal lobular texture of the DCP due to generalized marked vascular rarefaction in all 4 quadrants (Q1-Q4). Note the hypointense cystic spaces in the foveal area indicating CME compared to the rather normal FAZ appearance at the level of SCP. G. Corresponding en-face SS-OCT image at the level of the DCP in a 6 × 6 mm field. Note that the entire extent of cystoid spaces is best revealed at this plane. h. Corresponding flow-density map of the DCP in a 6 × 6 mm field

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