This Atlas of Endomicroscopy is the first book dealing with the new insights of endomicroscopy. It provides an overview about the development, the requirements, the technique, current indications and further possibilities of endomicroscopy. Endomicroscopy is a newly developed diagnostic tool that enables in vivo microscopy with subcellular resolution during ongoing endoscopy in the upper and lower gastrointestinal tract. It is a revolutionary technology because it provides the endoscopists with information about living cells in humans for the first time. Endoscopy and pathology are no longer separate subjects and, as a result, endomicroscopy leads to a close interaction between endoscopist and pathologist.