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A cystic space is seen in the region of the pineal gland, displacing the fornices upwards and the internal cerebral veins downwards. The pineal gland can be seen as separate from this region, below the internal cerebral veins - best seen on sagittal images. Features are characteristic of a cavum velum interpositum cyst.
On axial imaging it is triangular in shape. Incidental note is also made of a large cerebellomedullary cistern (mega cisterna magna).