Book excerpt: Part of the highly regarded Diagnostic Pathology series, this updated volume by Joel K. Greenson, MD, is a visually stunning, easy-to-use reference covering all aspects of gastrointestinal pathology. Outstanding images – including gross pathology, a wide range of pathology stains, and detailed medical illustrations – make this an invaluable diagnostic aid for every practicing pathologist, resident, or fellow. Time-saving reference features include bulleted text, a variety of test data tables, key facts in each chapter, annotated images, and an extensive index. Packed with even more high-resolution images than the previous edition – more than 2,500 in all – depicting virtually any GI specimen you’re likely to see. Thoroughly updated content, including new information on drug-induced GI diseases such as olmesartan enteropathy, molecular testing in GI cancers, familial cancer syndromes in the GI tract, and the molecular biology of GI tract tumors as it relates to precision medicine and targeted therapy.