Now completely updated and expanded, this important text delineates the spectrum of changes possible throughout the gastrointestinal tract. Coverage includes anatomy, infectious diseases, clinical manifestations, radiology, and pathologic analysis with numerous gross and microscopic photographs, line drawings, radiographs, and electron micrographs. Divided by anatomical section, each area is covered in chapters on normal anatomy, non-neoplastic lesions, and neoplastic lesions. Also covered: Inflammatory Bowel Disease, Polyposis Syndromes, Malignant Lymphomas and Hematologic Malignancies, Mesenchymal Neoplasms, and Cytology of the Gastrointestinal Tract. New in this edition: 30% expanded coverage, with many new illustrations; pathophysiologic concepts; more pediatric pathology; more mucosal biopsy interpretation; molecular biologic information; new chapter on AIDS-related diseases and motility disorders.