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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:Narrowing of medullary canal
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Accession:HP:0032458 term browser browse the term
Definition:A reduction in diameter and volume of the central cavity of bone where red or yellow bone marrow is located.
Synonyms:exact_synonym: Medullary cavity obliteration;   Narrowing of bone marrow canal;   Narrowing of bone medullary canal;   Narrowing of the marrow cavity

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the musculoskeletal system 0
        Abnormality of the skeletal system 0
          Abnormal skeletal morphology 0
            Narrowing of medullary canal 0
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