What is it?

Specified leukemia include:
Erythremia (acute and chronic)- A form of polycythemia of unknown cause, which is characterized in increased blood volume and red blood cells, bone marrow hyperplasia, redness or cyanosis of the skin and spleen enlargement.
Erythroleukemia- Cancer of the blood-forming tissues in which large numbers of immature, abnormal red blood cells are found in the blood and bone marrow. There are certain risk factors for this condition such as exposure to radiation, chemotherapy drugs and rare genetic chromosomal abnormalities.
Megakaryocytic leukemia- is a rare form of acute myeloid leukemia (AML) which is characterized with over 20% proliferation of megakaryoblasts. It is associated with chromosomal abnormalities and previous hematologic disorders.
These conditions are usually hard to treat, and share a bad prognosis.