Dilated Subfoveal Choroidal Veins in Eyes with myopic macula
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A Study was conducted to investigate the dilated choroidal veins (DCVs) at or around myopic macular neovascularizations (MNVs) and to determine whether there is a hemodynamic relationship between them.

57 patients with myopic MNVs had their eyes checked. Dilated choroidal veins were classified as veins that were 2X larger in diameter than adjacent veins. DCVs that crossed the subfoveal region were detected using indocyanine green angiography and swept-source optical coherence tomography images. The DCV and MNV filling sequences were determined.

Results:
--Patient's mean age was 71.4 ± 10.6 years. The mean axial length was 29.3 ± 1.8 mm.

--Dilated choroidal veins below or around the MNV were found in 17 eyes.

--Emissaries of the short posterior ciliary arteries were seen at or around MNVs in 8 of the 17 eyes.

--In these eyes, the short posterior ciliary artery was filled first or almost simultaneously with the filling of the MNV, followed by a laminar filling of the DCVs.

--In one eye, afferent arterioles from the short posterior ciliary arteries and efferent venules connected to DCVs were seen.

Finally, in around 30% of eyes with myopic MNVs, dilated choroidal veins are present below or around the MNVs. An MNV may be a vascular unit made up of short posterior ciliary arteries, afferent arterioles, efferent venules, and DCVs, according to the findings.

Source: https://journals.lww.com/retinajournal/Abstract/2021/05000/ROLE_OF_DILATED_SUBFOVEAL_CHOROIDAL_VEINS_IN_EYES.21.aspx
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