In surgical pathology practice, distinguishing malignant from benign melacytic lesions represents one of the major problem areas. Failure to diagse a malignant melama can have catastrophic results, but separating melamas from their simulants is often difficult, and over-diagsis of melama is also inappropriate. This edition presents a comprehensive account of benign and malignant melacytic lesions. The benign lesions encompass the major simulants of melama. In addition, some of them, such as dysplastic nevi, have significance as markers of individuals at increased risk for the development of melama. It has become ever more apparent, especially with the recent advent of molecular classification, that melama is t one disease, and that progsis in melama can vary considerably from lesions that present minimal risk, to dangerous malignancies at opposite ends of a spectrum. The details of therapy for these lesions are very different and are determined for the most part by their diagstic and progstic features as judged by microscopy. This edition explains in detail the use of attributes for microstaging and for prediction of progsis in melama, including discussion of the latest AJCC staging system. More importantly, however, it provides a richly-illustrated roadmap for diagsis of the entire spectrum of melacytic tumours. Discussion of the lesions is firmly grounded in their clinical significance, with detailed descriptions of clinical features often accompanied by clinical images. Lesions in general are illustrated in multiple microscopic images ranging from scanning magnification to high power. Cytologic as well as architectural features are clearly delineated. Pathophysiology, epidemiology, and molecular attributes are also discussed. This work will serve as a comprehensive text for learning on the part of trainees, and also as an invaluable diagstic reference for more experienced diagsticians in daily practice.