Endoscopic spine surgery is the essence of the minimally invasive surgery technique. It's a gradually developing field of spine surgery. Nevertheless, many doctors still have difficulties in acquiring an endoscope by themselves. This is especially true for transforaminal approach endoscopy. The editors of the book are pioneers in endoscopy and have had many interesting experiences related to transforaminal endoscopy. Since each patient has a different anatomy and disc shape, there are numerous practical techniques suitable for it, but few are specifically able to describe it. The main purpose of this book is to provide the essence of endoscopy to date, based on actual video images and practical techniques of transforaminal endoscopy accumulated over decades.