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In page Cerebroretinal microangiopathy with calcifications and cysts:

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By analogy to Coats disease, the exudative retinopathy is thought to result from breakdown of the blood-retinal barrier at the level of the vascular endothelial cell, resulting in leakage of blood plasma and lipid.[3] Macrophages then migrate into the retina and subretinal space and digest the lipid. The accumulation of the proteinaceous exudate and macrophages thickens the retina, leading to exudative retinal detachment.[citation needed]