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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:Abnormal subarachnoid space morphology
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Accession:HP:0012703 term browser browse the term
Definition:Abnormality in the space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid.
Synonyms:exact_synonym: Abnormality of the subarachnoid space
 xref: UMLS:C4022765

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the nervous system 0
        Abnormal nervous system morphology 0
          Morphological central nervous system abnormality 0
            Abnormal subarachnoid space morphology 0
              Distortion of the anterior part of the interhemispheric fissure 0
              Enlarged interhemispheric fissure 0
              Interhemispheric cyst 0
              Subarachnoid hemorrhage 0
              Widened subarachnoid space + 0
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