Figure 4: Intraoperative situs of the patient in Fig. 3 after interdisciplinary resection (ORL/Neurosurgery) of the tumor including the dura via a transfrontal-transbasal access. a: Left: titanium mesh in situ (arrows), fixed with titanium miniscrews. The frontal brain is lifted with the spatula. b: Right: collagen fleece (arrows) as second layer on the titanium mesh; before the frontal brain is tipped back and before the dura is closed using galeaperiostium.