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Background Professor Stummer on glioblastoma surgeries and iPDT: Treatment protocol 20 patients were treated. 5-ALA (Gliolan) was administered at a dosage of 20 mg/kg body weight 4 hours before anesthesia. Craniotomy was performed using FGR, with aim of maximal safe resection of the fluorescent tumor. Once there was no visible fluorescence or only tumor-infiltrated fluorescence in the eloquent areas left, PDT was performed. 1-4 cylindrical diffuser were strategically… READ MORE