Glioblastoma Simultaneously Present with Meningioma - Report of Three Cases - Nestler, U; Schmidinger, A; Schulz, C; Huegens-Penzel, M; Gamerdinger, U A; Koehler, A; Kuchelmeister, K W (Zentralblatt für Neurochirurgie - Central European Neurosurgery, 2007)