Soon after the 5th edition of this volume appeared, the WHO published details on the pathology and genetics of the hematopoietic and lymphatic tissues. Work in progress found in short journal articles had already been integrated into the last edition. Now it was possible to incorporate the new proposals for classification and diagnosis and to include figures of new types of leukemia and lymphoma. These include leukemias of dendritic cells, intravascular large B-cell lymphoma, the liver-spleen T-cell lymphoma as well as persistent polyclonal B-cell lymphocytosis, which is placed between benign and malignant
