1. From the Divisions of Neurology (N.S., A.P.A., L.A.), Neurosurgery (N.S.), and Neuropathology (R.R.), Department of Neurosciences and Mental Health, and Neuroradiology (C.M.), Hospital de Santa Maria, Centro Hospitalar Universitário de Lisboa Norte, Lisbon; and Centro de Estudos Egas Moniz, Faculdade de Medicina (A.P.A., L.A.), Universidade de Lisboa, Lisbon, Portugal.