Send us a Message

Submit Data |  Help |  Video Tutorials |  News |  Publications |  Download |  REST API |  Citing RGD |  Contact   


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:Megakaryocyte nucleus hyperlobulation
go back to main search page
Accession:HP:0031388 term browser browse the term
Definition:The presence of megakaryocytes in the bone marrow whose nuclei are more lobulated than expected for the size of the nucleus.
Comment:A large megakaryocyte with a hyperlobulated nucleus is a cell that is larger than average size and has more nuclear lobulation than average. Some such megakaryocytes are seen in normal bone marrows but when they are present as an increased proportion they should be commented on. Increased numbers are seen sometimes in myelodysplastic syndrome but they are more frequent in myelodysplastic/myeloproliferative neoplasms (MDS/MPN) and in MPN, particularly essential thrombocythemia.

show annotations for term's descendants           Sort by:

Term paths to the root
Path 1
Term Annotations click to browse term
  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
            Megakaryocyte nucleus hyperlobulation 0
paths to the root