Cystic dilatation of cavum velum interpositum
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Midline cystic lesion triangular in axial sections lying a higher level than the third ventricle and thalami and between the posterior aspects of the two lateral ventricles.
A cystic dilatation of cavum velum interpositum should not be confused with the diagnosis of CVI arachnoid cyst, what favours a cystic dilatation over an arachnoid cyst is that the former does not cause mass effect or hydrocephalus as it communicates with adjacent cisterns. On the opposite side, a cyst of the CVI could obstruct the ventricles, causing clinical symptoms that can mimic those of a third ventricular mass. As demonstrated in our study the ventricles are of normal size with no symptoms, and thus discovered accidentally during a routine exam of the brain.