Dissertation title: Researching of endoscopic endonasal transsphenoidal surgery in treating craniopharyngiomas Major: Neurosurgery Major code: 62720127 PhD student: Nguyen Thanh Xuan Supervisor: Associate Professor, Dr Kieu Dinh Hung Training center: Hanoi Medical University New findings of the doctoral dissertation: This is a detailed and complete study of endoscopic endonasal transsphenoidal surgery with clear indications for Kassam grade I, II, III craniopharyngeal tumors.