<prompt> Which of the following is NOT a myeloproliferative disease:Polycythemia rubra veraAcute myeloid leukemiaChronic myeloid leukemiaEssential thrombocytosis  <response>: Answer is B Acute myeloid leukemia The myeloproliferative disorders are characterized pathophysiologically by clonal expression of a multipotent hematopoitic progenitor cell with the overproduction of one or more of the formed elements of Blood. These disorders may transform into acute leukemia naturally or as a consequence of mutagenic treatment. Myeloproliferative disorders classically include: - Polycythemia veraQ - Idiopathic myelofibrosisQ - Essential thrombocytosisQ - Chronic myeloid leukemiaQ 