Media type: E-Article Title: Surgical Instrument Tracking Optimizes Trans-Sphenoidal Endoscopic Treatment of Petrous Apex Cholesterol Granuloma Contributor: Froelich, Sebastien; Woerdeman, Peter; Berkelbach van der Sprenkel, Jan; Braunius, Weibel; Regli, Luca; Voormolen, Eduard imprint: Georg Thieme Verlag KG, 2012 Published in: Journal of Neurological Surgery Part A: Central European Neurosurgery Language: English DOI: 10.1055/s-0032-1326945 ISSN: 2193-6315; 2193-6323 Keywords: Neurology (clinical) ; Surgery Origination: Footnote: