Brain tumor surgery, Endoscopic procedure, Craniotomy, Minimally invasive surgery, Minimally invasive neurosurgery, Sku...ll base surgery, Endoscopic transnasal transsphenoidal surgery, Keyhole craniotomy, CSF leak, Epilepsy, Glioma, Esthesioneuroblastoma, Brain tumor, Pituitary tumor, Acoustic neuroma, Brain cancer, Chondrosarcoma, Chordoma, Glioblastoma, Craniopharyngioma, Astrocytoma, Meningioma, Brain metastasis, Oligodendroglioma, Glioma-associated epilepsy, Brain tumor-associated epilepsy, Oligoastrocytoma, Skull base tumor