After the resolution of CSC, the subfoveal choroidal thickness and thickness of Haller's layer declined, but the reduced diameter of subfoveal choroidal vessels accounted for only about half of the total thickness changes in the choroid. These results suggest that nonvascular smooth muscle cells might play a role in the thickening of the choroid during CSC and possibly in the pathogenesis and progression of CSC.
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Chung et al. (2017) studied this question.
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