This book addresses all histopathologic aspects of tumor pathology essential for grading of tumors. It discusses the history and basic tenets of tumor grading; principles of microscopic grading of tumors; ancillary methods currently used to improve tumor grading; and new techniques used in evaluating tumors and formulating prognosis. It is designed to be a practice-oriented, concise and well-illustrated resource for diagnostic surgical pathologists and pathology residents. The manual is organized by specific organ systems. Each chapter begins with an introduction and describes in detail the optimal and most widely used system for grading common tumors.