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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

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Accession:HP:0100036 term browser browse the term
Definition:A band of bone material of decreased density forming alongside the surface of the cortical bone with thickening of the periosteum. Callus formation in the affected area is common and gives the appearance of a false fracture.
Comment:Typical sites of involvement are the axillary margins of the scapula, ribs, pubic rami, proximal ends of the femur and ulna. On x-rays pseudo-fractures appear as a lucent line about 1 -2 cm wide, vertical to the cortex and are pathognomonic of osteomalacia, seen on the concave side and are also seen in Paget disease on the convex side of the bone.
Synonyms:exact_synonym: Looser zones
 xref: UMLS:C4021028

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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
            Abnormal bone structure 0
              Abnormal cortical bone morphology 0
                Pseudo-fractures 0
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