[Operative neurosurgery: personal view and historical backgrounds (1). EC-IC bypass]

This series on surgical technique of neurosurgery contains following topics: EC-IC bypass, aneurysm-AVM surgery, surgery of deep seated tumors such as craniopharyngioma, pineal region tumors, surgery of skull base tumors, intramedullary spinal cord tumors, amygdalohippocampectomy and others. They are originating from author's personal point of view based on his experience and are presented with various techniques learnt from my teachers and colleagues from different countries also mentioning related anecdotes and historical backgrounds. In this issue, presented are the topics about training of microsurgical anastomosis in the laboratory along with belonging techniques and instruments, clinical STA-MCA bypass, OA-PCA bypass and interposition graft bypass including "bonnet" bypass.