Book excerpt: Gastroenterology and Hepatology encompass a vast anatomic assortment of organs with diverse structure and function and the potential for affliction from a multiplicity of diseases. Completely covering these complex and interrelated systems, Mayo Clinic Gastroenterology and Hepatology Board Review provides an in-depth examination of essential knowledge in gastroenterology, hepatology, and the integral related areas of pathology, endoscopy, nutrition, and radiology. With contributions from experts at Mayo Clinic who are currently in clinical practice and have a strong commitment to teaching, the book assists physicians-in-training to prepare for the gastroenterology board examination.