This book comprises an in-depth view on the current knowledge of chronic clonal myeloid diseases. Special emphasis is laid on chronic myeloid leukaemia and classic myeloproliferative disorders (essential thrombocythemia, polycythemia vera, chronic idiopathic myelofibrosis) as well as myelodysplastic syndromes, oligoblastic leukemias, paroxysmal nocturnal hemoglobinuria and overlap diseases. Both young physicians in hematological training as well as practicing hematologists are addressed, with the aim of imparting a clear understanding of these disorders. In-depth information on the most relevant cell-biological pathways is accentuated by graphics. Guidelines for diagnosis, complemented by cytological, histological and clinical photos, as well as easy-to-follow algorithms with clinical as well as laboratory findings are provided. Current management of routine as well as precarious clinical situations are discussed and supplemented with boxes highlighting the most relevant information in keywords.