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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:Anal atresia
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Accession:HP:0002023 term browser browse the term
Definition:Congenital absence of the anus, i.e., the opening at the bottom end of the intestinal tract.
Synonyms:exact_synonym: Absent anus
 related_synonym: Imperforate anus
 alt_id: HP:0001550
 xref: Fyler:4402;   Fyler:4443;   MEDDRA:10002120 "Anal atresia";   MESH:D001006;   SNOMEDCT_US:204712000;   SNOMEDCT_US:204731006;   UMLS:C0003466

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Term paths to the root
Path 1
Term Annotations click to browse term
  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the digestive system 0
        Abnormal digestive system morphology 0
          Abnormal anus morphology 0
            Anal atresia 0
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