This atlas composes of original contributions of characteristic cases of small intestinal diseases. The typical small intestinal diseases related cases are discussed in this book. Each case in the atlas is introduced with relevant clinical history and exemplified with educatory endoscopy images. With abundant illustrations, this atlas provides valuable information learned from the diagnoses and treatments of the patients with small intestinal diseases. It also introduces the advances of the latest medical technologies in small intestinal medicine, such as capsule endoscopy, double-balloon enteroscopy, and single-balloon enteroscopy. Small intestinal medicine is an emerging, fascinating and important discipline in gastroenterology. This Atlas can serve as a useful and educational guide to young doctors and a refreshing reference book to educators in this field, and hence promoting better clinical care for their patients.