From the Departments of Neurosurgery (M.H., T.R.V., G.W.M.) and Neurology (H.V.V.), Divisions of Pediatric Neurology (M.S.P., J.Y.W., J.T.L., J.H.M., S.Y., W.D.S., R.S.), Neuroradiology (N.S.), and Neuropathology (H.V.V.), David Geffen School of Medicine, University of California, Los Angeles. (At 2010-06)