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Fig. 4 | Eye and Vision

Fig. 4

From: Morphological changes in intraretinal microvascular abnormalities after anti-VEGF therapy visualized on optical coherence tomography angiography

Fig. 4

Baseline morphological appearances of IRMAs. Row 1: Dilated trunk IRMA (red arrow) has increased caliber compared to the surrounding capillary bed and end blindly, with either a straight or a slightly curved shape. Row 2: Looped IRMA (green arrow) is a circular loop vascular channel originating from and draining into the same vessel. Row 3: Twisted loop or pigtail IRMA (yellow arrow) is a loop with self-rolling to resemble single or adjacent figures-of-eight with a more irregular twisting pigtail appearance. Row 4: Sea-fan shaped IRMA (blue arrow) has a branching pattern of vascular growth and the feeding and draining vessels are confined to a narrow base, forming the outline of a triangle. Row 5: Net-shaped IRMA (purple arrow) has a complex shape such that the feeding and draining vessels are not confined to a narrow base and cannot be accurately identified, and this IRMA has a rectangular or irregular outline

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