Newly Diagnosed? We Can Help Getting the correct diagnosis and the most appropriate treatment from the start is crucial 
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This section includes descriptions of several rare blood cancers. These blood disorders develop when the normal process of blood cell growth and development (hematopoiesis) breaks down and a malignancy of the blood cells arises. Abnormally large quantities of a specific type of blood cell are produced in the bone marrow or lymphatic tissues, or abnormal blood cells are produced that do not function properly.
Among the uncommon blood cancers outlined are lymphoproliferative disorders (diseases of white blood cells called T cells and B cells); myeloproliferative disorders (diseases in which too many of certain types of blood cells are made in the bone marrow); and four other uncommon blood disorders -- eosinophilia, histiocytosis, paroxysmal nocturnal hemoglobinuria, and systemic mastocytosis.
Patients with any blood cancer that occurs relatively infrequently may have difficulty finding information about where and from whom to obtain the best treatment. All patients with cancer should seek care from a physician or team experienced in treating his or her disease, and this is especially important for patients with rare blood cancers, because these diseases may be difficult to diagnose -- but are sometimes easily treated if diagnosed correctly. Many Memorial Sloan-Kettering physicians have developed unequaled expertise in diagnosing and treating some of the rarest forms of cancer.