a) Theory and core principles of Gliolan-fluorescence-guided surgery and malignant glioma resection, including methods of eloquent sites identification; b) On-site instructions on the use of the fluorescence-microscope, including pitfalls and recognition of problems; c) Differentiation of fluorescence intensity, maintaining safety distances from eloquent areas, etc. d) The practice of Gliolan-fluorescence-guided surgery (including participation in at least one cases using Gliolan-fluorescence-guided surgery in the operating room with on-site instructions on the use of the microscope or demonstration of a fluorescence-guided resection by video); e) The current understanding of the benefits and risks of cytoreductive surgery in the management of patients with malignant gliomas; f) The theoretical base for porphyrin accumulation in malignant gliomas; g) The technical principles behind fluorescence-guided resections using Gliolan; h) How to identify suitable candidates for fluorescence-guided resections using Gliolan; i) How to apply Gliolan in the correct dosage and timing regimen, and to understand the importance of concurrent corticosteroids; j) How to identify patients at risk for neurological deficits using fluorescence-guided resections with Gliolan with special focus on aphasias and other critical focal deficits;