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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:Amniotic constriction ring
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Accession:HP:0009775 term browser browse the term
Definition:Annular constrictions around the digits, limbs, or trunk, occurring congenitally (sometimes causing intrauterine autoamputation) and also associated with a wide variety of disorders. Constrictive amniotic bands are the result of primary amniotic rupture, which can lead to entanglement of fetal tissue (especially limbs) in fibrous amniotic strands.
Comment:Pseudoainhum is a rare condition of unknown etiology that produces digital constricting rings, most commonly on the small fingers.
Synonyms:exact_synonym: Amniotic bands;   Congenital constriction band sequence;   Pseudoainhum
 related_synonym: Amniotic constriction band
 alt_id: HP:0001078
 xref: MESH:C535821;   MESH:D000652;   SNOMEDCT_US:19988008;   SNOMEDCT_US:238879003;   UMLS:C0334166;   UMLS:C1527388

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of prenatal development or birth 0
        Abnormalities of placenta or umbilical cord 0
          Abnormal placental membrane morphology 0
            Amniotic constriction ring 0
              Amniotic constriction rings of arms 0
              Amniotic constriction rings of legs 0
              Digital constriction ring 0
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