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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 placenta morphology
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Accession:HP:0100767 term browser browse the term
Definition:An abnormality of the placenta, the organ that connects the developing fetus to the uterine wall to enable nutrient uptake, waste elimination, and gas exchange.
Comment:The placenta is a fetomaternal organ. The fetal portion of the placenta is the villous chorion and the maternal portion is the decidua basalis. The two portions are connected by anchoring villi that are anchored to the decidua basalis by the cytotrophoblastic shell.
Synonyms:exact_synonym: Abnormality of the placenta;   Placental issue
 xref: SNOMEDCT_US:169957005;   SNOMEDCT_US:33552005;   UMLS:C1306893

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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 placenta morphology 0
            Abnormal chorion morphology + 0
            Abnormal placental adhesion into the uterine wall + 0
            Abnormal placental size + 0
            Calcified placenta 0
            Chorangioma 0
            Choriocarcinoma 0
            Fetal vascular malperfusion 0
            Maternal vascular malperfusion 0
            Placenta previa 0
            Placental abruption 0
            Placental infarction 0
            Placental mesenchymal dysplasia 0
            Subchorionic septal cyst 0
            Subchorionic thrombohematoma 0
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