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A supracerebellar CSF intensity cyst measuring 33 x 34 x 29 mm produces mass effect on the cerebellum and elevates the tentorium cerebelli and displaces the pineal gland a little superiorly and anteriorly. It is slightly eccentric to the right, resulting in slightly greater inferior cerebellar tonsillar herniation on the right (6 mm) than on the left (3 mm). The tectum is not significantly compressed and no hydrocephalus is present.