San Francisco, California, January 7, 2011 -University of California San Francisco Medical Center nurse Nadja Levesque RN pours a bottle of Lactated Ringer's solution - a saline solution with added electrolytes - that is used to keep the brain set during surgery during a procedure to separate the Corpus callosum. .Neurologist and Co-Director for the Center for Neural Engineering at UC Berkeley and San Francisco, Dr. Edward Chang and visiting fellow Dr. Ellen Air perform a procedure to separate the Corpus callosum, a broad band of nerve fiber joining the left and right side of the brain on patient Savanna Kelley at the UCSF Medical Center.. When Ms. Kelley was three she developed leukemia. With her father serving time in Iraq during the first Gulf War, her mother made the decision to try an experimental chemotherapy. Her mother, Marisa Martin says this treatment stunted Ms. Kelley's mental growth. A few years later Ms. Kelley began to have seizures. These seizures have intensified more recently starting in one hemisphere and rapidly spread to the other, multiplying the effect. Such patients often fall suddenly when a seizure strikes and hurt themselves. This surgery doesn't prevent seizures, but it reduces their severity by confining them to one hemisphere and makes falls less likely..