Leukaemia (synonym: leukemia, leukemia) is a malignant disease of the blood system, characterized by proliferation of immature cells of hematopoietic tissue, which lose their ability to ripen. The resulting cells crowd out normal blood-forming organs. The growth of abnormal cells occurs not only in the bone marrow, but also in other tissues and organs, where normal blood formation does not occur. In the peripheral blood along with normal leukocytes come and immature forms. Depending on the types of cells that form the basis of blood, and cellular level at which detected the loss of the ability to ripen, the leukemia is divided into acute and chronic. The latter are divided into mielo - and limfoleikoze. Both chronic and acute leukemia are independent disease. Special forms of leukemia, which are based on the expansion of the items actually reticular stroma, carry the name of retikuleze (see). Original clinical and morphological variant of acute leukemia is erythromelas (see).
Currently, the leukemia is considered as polietiologichesky tumorous disease. In all forms of leukaemia, the number of leukocytes may be increased, normal, or even reduced. The main diagnostic indicator is the presence in punctate bone marrow or peripheral blood of abnormal cells.

Leukaemia (from the Greek. leukos - white; synonym: leukemia, leukemia) is a systemic disease characterized by progressive hyperplastic and metaplastic growth source of cells retikuliarna stroma and their initial transformations in various parenchyma cells of the blood. This process when leukemia is aggressive in nature with generalized defeat systems and organs; it is due to the malignant transformation of cells in the blood and loss of the ability to differentiation (anaplasia). Depending on what the cellular level is detected anaplasia, usually classified L. To retikulez, genocidalists, myelogenous leukemia, limfoleikoze, erythromelas, megakaryocytes L. In patients L. a malignancy of the blood cells finds expression in a wide variety of structural and cytochemical changes both in the kernel and in the cytoplasm, making them a little similar or completely different to physiologically saved cells of hemopoiesis.