Dark Signals in the Choroidal Vasculature on Optical Coherence Tomography Angiography: An Artefact or Not?

Figure 4

Vascular signals in the middle layer of the choroid. (a) En face OCTA shows cord-like dark vessels (red arrows) attributable to higher blood flow and a hyperreflective choroidal stroma (yellow arrow head) as a result of fringe washout artefact and stromal decorrelation signal. (b) Cross-sectional OCTA confirms a hypointense halo and shows the scanning level. OCTA: optical coherence tomography angiography.

(a)

(b)