Depends: You should have him seen by a neurosurgeon. He may need a surgical procedure. There are a few surgeries possible. It depends on the size and exact location of the cyst in the posterior fossa and what it is pushing against (most likely the brain stem ) . The neurosurgeon can best advise you as to whether or not surgery is necessary. Difficult to answer without seeing scans.
Answered 7/28/2013
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See below: Talk to a neurosurgeon. If the arachnoid cyst is interfering with the flow of CSF then it can be surgically treated. The low blood pressure and heart rate is not too concerning at this point.
Answered 4/24/2015
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