Intraventricular simple cyst
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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).
The features are typical and characteristic of an intraventricular simple cyst, which are most common in just this location - just above the trigone in the posterior aspect of the body of the lateral ventricle.
This lesion has been followed up with, not surprisingly, no change over 3 years.