{
  "id": 25939,
  "label": "isolated optic nerve aplasia",
  "model": {
    "label": "Mondo Disease Ontology (MONDO)",
    "source": 0
  },
  "type_id": 0,
  "reference_id": "MONDO:0958342",
  "properties": {
    "xrefs": [
      "GARD:0027016",
      "MEDGEN:1836872",
      "Orphanet:637064",
      "UMLS:C5816782"
    ],
    "categories": [
      {
        "ref": "MONDO:0005071",
        "name": "nervous system disorder"
      },
      {
        "ref": "MONDO:0024458",
        "name": "disorder of visual system"
      }
    ],
    "definition": "A rare developmental defect during embryogenesis characterized by congenital absence of the optic nerve head, optic nerve fibers, retinal ganglion cells, and retinal blood vessels in a malformed eye. It often occurs unilaterally with otherwise normal brain development. In bilateral cases it is accompanied by other central nervous system malformations."
  },
  "isLeaf": true,
  "isRoot": false,
  "child_count": 0,
  "parents": [
    {
      "id": 4268,
      "label": "optic nerve disorder",
      "isLeaf": false,
      "isRoot": false,
      "parents": [
        4657,
        5469,
        21415
      ],
      "type_id": 0,
      "properties": {
        "xrefs": [
          "DOID:1891",
          "ICD9:377.49",
          "ICD9:377.9",
          "MEDGEN:854546",
          "MESH:D009901",
          "NCIT:C79698",
          "SCTID:77157004",
          "UMLS:C3887709"
        ],
        "synonyms": [
          "cranial nerve II disease",
          "cranial nerve II disease or disorder",
          "disease of cranial nerve II",
          "disease or disorder of cranial nerve II",
          "disorder of cranial nerve II",
          "optic nerve disorder",
          "second cranial nerve disorder"
        ],
        "categories": [
          {
            "ref": "MONDO:0005071",
            "name": "nervous system disorder"
          },
          {
            "ref": "MONDO:0024458",
            "name": "disorder of visual system"
          }
        ],
        "definition": "A non-neoplastic or neoplastic disorder affecting the optic nerve (second cranial nerve)."
      },
      "child_count": 24,
      "reference_id": "MONDO:0002135"
    }
  ],
  "children": [],
  "roots": [
    {
      "id": 4268,
      "label": "optic nerve disorder"
    }
  ]
}