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Within the left lateral ventricle, there is a cyst which follows CSF signal on all sequences including DWI. The mass has a thin hypointense wall and there is no nodularity or enhancement. Normal vessels and normal choroid plexus are seen to curve around the lesion.
While the lateral ventricle is focally expanded due to the mass, the ventricles are otherwise not dilated. There is no evidence of transependymal CSF flow.
Brain parenchyma is normal in appearance time of flight MRA (not shown) demonstrates unremarkable intracranial arterial vasculature.
Left simple intraventricular cyst with no suspicious features (arachnoid / ependymal cyst).