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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Increased multinucleated megakaryocyte count
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Accession:HP:0031387 term browser browse the term
Definition:The presence of abnormally high numbers of multinucleated megakaryocytes in the bone marrow.
Comment:A multinucleated megakaryocyte is a cell of normal size with two or more nuclei. Binucleated micromegakaryocytes should be categorized as such rather than as multinucleated megakaryocytes since the restricted size is of more diagnostic significance than the presence of two nuclei. Multinucleated megakaryocytes are seen in small numbers in normal bone marrow aspirates but in larger numbers in some patients with MDS.

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of blood and blood-forming tissues 0
        Abnormality of bone marrow cell morphology 0
          Abnormal megakaryocyte morphology 0
            Increased multinucleated megakaryocyte count 0
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