This example demonstrates using the bodystructure resource to identify a specific tumor or lesion that will have multiple observations and/or procedures performed on it over time

{
  "resourceType" : "BodyStructure",
  "id" : "tumor",
  "identifier" : [{
    "system" : "http://goodhealth.org/bodystructure/identifiers",
    "value" : "12345"
  }],
  "morphology" : {
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "4147007",
      "display" : "Mass (morphologic abnormality)"
    }],
    "text" : "Splenic mass"
  },
  "includedStructure" : [{
    "structure" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "78961009",
        "display" : "Splenic structure (body structure)"
      }],
      "text" : "Spleen"
    }
  }],
  "description" : "7 cm maximum diameter",
  "image" : [{
    "contentType" : "application/dicom",
    "url" : "http://imaging.acme.com/wado/server?requestType=WADO&wado_details"
  }],
  "patient" : {
    "reference" : "Patient/example"
  }
}