Abstract
Endoscopic endonasal approaches are increasingly becoming the state of art in transsphenoidal pituitary surgery. The goal of this study is first to briefly introduce nasal and sphenoidal phases of the approach along with reconstruction phase. Then, the key points of radiologic studies of various parts of the surgery with images and movies are discussed. Difficult cases from 350 surgeries will be showed and technical modifications in each phase according to later cases were noticed. Furthermore, the disadvantages and pitfalls are highlighted illustratively. KEYWORDS: Endoscopic, Endonasal, Pituitary