NCIt definition : A chronic myeloproliferative neoplasm characterized by an increased red blood cell
production. The bone marrow is hypercellular due to a panmyelotic proliferation typically
characterized by pleomorphic megakaryocytes. The major symptoms are related to hypertension,
splenomegaly or to episodes of thrombosis and/or hemorrhage.;
Alternative definition : NCI-GLOSS: A disease in which there are too many red blood cells in the bone marrow
and blood, causing the blood to thicken. The number of white blood cells and platelets
may also increase. The extra blood cells may collect in the spleen and cause it to
become enlarged. They may also cause bleeding problems and make clots form in blood
vessels.;
Neoplastic status : Malignant;
ICD-O code : 9950/3;
Codes from synonyms : CDR0000426418; 10036061; D45;