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Source1

{
  "resourceType": "CodeSystem",
  "id": "snomed-extension-lt-colorectal",
  "language": "en",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "url": "https://tx.hl7.lt/fhir/CodeSystem/snomed-extension-lt-colorectal",
  "version": "0.0.1",
  "name": "SnomedExtensionLtColorectalCS",
  "title": "SNOMED CT Extension for Colorectal Screening",
  "status": "active",
  "experimental": false,
  "date": "2026-03-29T14:00:12+00:00",
  "publisher": "Lithuanian Medical Library",
  "contact": [
    {
      "name": "Lithuanian Medical Library",
      "telecom": [
        {
          "system": "url",
          "value": "https://medicinosnk.lt"
        },
        {
          "system": "email",
          "value": "info@medicinosnk.lt"
        }
      ]
    }
  ],
  "description": "Extension CodeSystem for concepts used in the Lithuanian colorectal cancer screening program that are not available in SNOMED CT.",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "urn:iso:std:iso:3166",
          "code": "LT"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "content": "complete",
  "count": 53,
  "concept": [
    {
      "code": "paris-classification",
      "display": "Paris endoscopic classification",
      "definition": "Paris endoscopic classification of superficial neoplastic lesions"
    },
    {
      "code": "nice-classification",
      "display": "NICE classification",
      "definition": "NBI International Colorectal Endoscopic classification"
    },
    {
      "code": "polyp-access",
      "display": "Access to polyp",
      "definition": "Difficulty of access to the polyp during endoscopy"
    },
    {
      "code": "smsa-score",
      "display": "SMSA score",
      "definition": "Size, Morphology, Site, and Access score for polypectomy difficulty"
    },
    {
      "code": "predicted-histology",
      "display": "Predicted histology",
      "definition": "Predicted histological type based on endoscopic appearance"
    },
    {
      "code": "paris-Is",
      "display": "Paris 0-Is (sessile/polypoid)"
    },
    {
      "code": "paris-Isp",
      "display": "Paris 0-Isp (semi-pedunculated)"
    },
    {
      "code": "paris-Ip",
      "display": "Paris 0-Ip (pedunculated)"
    },
    {
      "code": "paris-IIa",
      "display": "Paris 0-IIa (slightly elevated)"
    },
    {
      "code": "paris-IIb",
      "display": "Paris 0-IIb (flat)"
    },
    {
      "code": "paris-IIc",
      "display": "Paris 0-IIc (slightly depressed)"
    },
    {
      "code": "lst-g-h",
      "display": "LST-G-H (Laterally spreading, granular type, homogeneous)",
      "definition": "Equivalent to Paris 0-IIa"
    },
    {
      "code": "lst-g-nm",
      "display": "LST-G-NM (Laterally spreading, granular type, non-homogeneous)",
      "definition": "Equivalent to Paris 0-IIa + Is"
    },
    {
      "code": "lst-ng-fe",
      "display": "LST-NG-FE (Laterally spreading, non-granular type, flat elevation)",
      "definition": "Equivalent to Paris 0-IIa"
    },
    {
      "code": "lst-ng-pd",
      "display": "LST-NG-PD (Laterally spreading, non-granular type, depressed)",
      "definition": "Equivalent to Paris 0-IIa + IIc"
    },
    {
      "code": "nice-1",
      "display": "NICE Type I",
      "definition": "Hyperplastic/sessile serrated lesion"
    },
    {
      "code": "nice-2",
      "display": "NICE Type II",
      "definition": "Adenoma (low/high grade dysplasia)"
    },
    {
      "code": "nice-3",
      "display": "NICE Type III",
      "definition": "Deep submucosal invasive cancer"
    },
    {
      "code": "nice-not-evaluated",
      "display": "NICE Not evaluated"
    },
    {
      "code": "access-easy",
      "display": "Easy",
      "definition": "Easy access to the polyp. SMSA scale: 1 point."
    },
    {
      "code": "access-heavy",
      "display": "Heavy",
      "definition": "Difficult access to the polyp. SMSA scale: 3 points."
    },
    {
      "code": "budding-bd0",
      "display": "No tumor budding (Bd0)",
      "definition": "0 buds per 20X field"
    },
    {
      "code": "budding-bd1",
      "display": "Bd1 (1-4 / 20X RL)",
      "definition": "Low tumor budding: 1-4 buds per 20X field"
    },
    {
      "code": "budding-bd2",
      "display": "Bd2 (5-9 / 20X RL)",
      "definition": "Intermediate tumor budding: 5-9 buds per 20X field"
    },
    {
      "code": "budding-bd3",
      "display": "Bd3 (10+ / 20X RL)",
      "definition": "High tumor budding: 10 or more buds per 20X field"
    },
    {
      "code": "budding-invaluable",
      "display": "Invaluable",
      "definition": "Tumor budding cannot be assessed"
    },
    {
      "code": "pdc-none",
      "display": "No poorly differentiated clusters"
    },
    {
      "code": "pdc-g1",
      "display": "PDC-G1 (1-4 / 20X RL)"
    },
    {
      "code": "pdc-g2",
      "display": "PDC-G2 (5-9 / 20X RL)"
    },
    {
      "code": "pdc-g3",
      "display": "PDC-G3 (10+ / 20X RL)"
    },
    {
      "code": "pdc-invaluable",
      "display": "PDC Invaluable"
    },
    {
      "code": "mmrp-normal",
      "display": "Normal expression (MMR proficient, MSS)"
    },
    {
      "code": "mmrp-loss",
      "display": "Loss of expression (MMR deficient, MSI)"
    },
    {
      "code": "mmrp-invaluable",
      "display": "MMRP Invaluable"
    },
    {
      "code": "mmrp-postponed",
      "display": "MMRP Postponed"
    },
    {
      "code": "mmrp-undefined",
      "display": "MMRP Undefined (MSS)"
    },
    {
      "code": "mol-postponed",
      "display": "Postponed",
      "definition": "Molecular test has been postponed"
    },
    {
      "code": "mol-detected",
      "display": "Detected mutation",
      "definition": "Mutation has been detected"
    },
    {
      "code": "mol-not-detected",
      "display": "Undefined mutation",
      "definition": "No mutation detected / undefined"
    },
    {
      "code": "mol-set",
      "display": "Set (MSI)",
      "definition": "MSI status has been established"
    },
    {
      "code": "msi-test",
      "display": "MSI (Microsatellite instability study)",
      "definition": "Microsatellite instability study. KLTN code: XLT00915-2"
    },
    {
      "code": "kras-test",
      "display": "KRAS mutation test",
      "definition": "KRAS gene mutation analysis"
    },
    {
      "code": "nras-test",
      "display": "NRAS mutation test",
      "definition": "NRAS gene mutation analysis"
    },
    {
      "code": "braf-v600e-test",
      "display": "BRAF V600E mutation test",
      "definition": "Study of BRAF gene V600 variants. KLTN code: XLT00914-5"
    },
    {
      "code": "haggitt-0",
      "display": "Haggitt 0"
    },
    {
      "code": "haggitt-1",
      "display": "Haggitt 1"
    },
    {
      "code": "haggitt-2",
      "display": "Haggitt 2"
    },
    {
      "code": "haggitt-3",
      "display": "Haggitt 3"
    },
    {
      "code": "haggitt-4",
      "display": "Haggitt 4"
    },
    {
      "code": "kikuchi-sm1",
      "display": "Sm1 according to Kikuchi"
    },
    {
      "code": "kikuchi-sm2",
      "display": "Sm2 according to Kikuchi"
    },
    {
      "code": "kikuchi-sm3",
      "display": "Sm3 according to Kikuchi"
    },
    {
      "code": "invasion-invaluable",
      "display": "Invasion depth invaluable"
    }
  ]
}