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Images reveal arachnoid granulation in a 51-year-old woman with headache. (A) MRV shows stenosis on RTS with left occlusion/ hypoplasia; (B) T1w black-blood image shows an oval arachnoid granulation that is isointense to brain parenchyma; (C) T1w black-blood contrast-enhanced image shows a an oval arachnoid granulation and an enhanced dural venous sinus wall; (D) T1w contrast-enhanced image shows a moth-eaten filling defect.
