Hollis is scheduled to have a "functional hemispherectomy", rather than an "anatomical hemispherectomy". The primary difference is that with a functional, the hemisphere that is causing the seizures is left in place, and is neurologically disconnected from the healthy hemisphere. With the anatomical, the whole hemisphere is removed, leaving a space in the head which fills with cerebrospinal fluid. Here is a link to Cleveland Clinic's description of the procedure.
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