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MRI demonstrates that the expansion is caused by a very thin-walled (best seen on T2 fast spine echo sequences) cystic lesion which follows CSF on all sequences, including FLAIR and DWI.
Except for the location, the appearances are characteristic for a simple intraventricular cysts, sometimes referred to (perhaps more accurately in these cases) as CSF cysts, are uncommon but well described.
The absence of an enhancing component makes other lesions most unlikely.