LI-RADS · Fígado

LI-RADS Liver Imaging Reporting and Data System, CT/MRI v2018

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Categorization of liver observations in patients at risk for hepatocellular carcinoma using major imaging features.

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Escala de categorias

LR-1 LR-2 LR-3 LR-4 LR-5 LR-M LR-TIV

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Procedência e vigência

Órgão emissor: American College of Radiology
Versão: CT/MRI v2018
Ano: 2018
Família: léxico
Tipo de lógica: matrix
Modalidade: CT, MRI
Fonte primária: Liver Imaging Reporting and Data System (LI-RADS) Version 2018: Imaging of Hepatocellular Carcinoma in At-Risk Patients · doi:10.1148/radiol.2018181494
Última verificação: 2026-06-22
Última checagem: 2026-06-22

Lógica de decisão

Forma estruturada (matrix). Uma futura calculadora a lê; as categorias abaixo são a superfície legível.

The CT/MRI diagnostic table mapping major features to categories pending sourcing with locator.

Mostrar a lógica estruturada (JSON)

{
  "axes": {
    "major_features": [
      "arterial_phase_hyperenhancement",
      "diameter",
      "washout",
      "enhancing_capsule",
      "threshold_growth"
    ]
  },
  "categories": [
    "LR-1",
    "LR-2",
    "LR-3",
    "LR-4",
    "LR-5",
    "LR-M",
    "LR-TIV"
  ],
  "cells": null
}

Categorias num relance

Cat.	Significado	Conduta	Risco	Fonte
LR-1	Definitely benign Observation with definitely benign appearance. Examples given include simple cyst, typical hemangioma, perfusion alteration, focal fat deposition or sparing, hypertrophic pseudomass, and confluent fibrosis.	—	—	okfonte radiologyassistant.nl LI-RADS page, section 'LI-RADS 1 - definitely benign'
LR-2	Probably benign Probably benign observation. Includes lesions such as atypical cyst/hemangioma, perfusion alteration, fat deposition, hypertrophic pseudomass or confluent fibrosis, and distinct nodules smaller than 20 mm without malignant features (e.g. T1-hyperintense, T2-hypointense, siderotic, or hepatobiliary-phase hyperintense nodules).	—	Per the page, roughly 16% of LR-2 observations are hepatocellular carcinoma and about 18% are malignant overall.	okfonte radiologyassistant.nl LI-RADS page, section 'LI-RADS 2 - probably benign'
LR-3	Intermediate probability of malignancy Intermediate probability of malignancy. Includes lesions resembling focal nodular hyperplasia or hepatic adenoma; nodules smaller than 20 mm lacking major features but showing ancillary malignancy findings (such as intralesional fat, T2 hyperintensity, diffusion restriction, or hepatobiliary-phase hypointensity); and nodules 20 mm or larger lacking both major and ancillary features.	—	Per the page, about 37% of LR-3 observations are hepatocellular carcinoma and about 39% are malignant overall.	okfonte radiologyassistant.nl LI-RADS page, section 'LI-RADS 3 - intermediate probability'
LR-4	Probably HCC Probably hepatocellular carcinoma. Assignment depends on observation diameter, presence of non-rim arterial-phase hyperenhancement, and the number of additional major features present (washout, enhancing capsule, threshold growth).	—	Per the page, about 74% of LR-4 observations are hepatocellular carcinoma and about 81% are malignant overall.	okfonte radiologyassistant.nl LI-RADS page, section 'LI-RADS 4 - probably HCC'
LR-5	Definitely HCC Definitely hepatocellular carcinoma, requiring non-rim arterial-phase hyperenhancement plus, depending on size: an observation larger than 20 mm with washout or enhancing capsule; an observation 10-20 mm with two additional major features; or an observation smaller than 10 mm with both washout and enhancing capsule.	—	Per the page, about 95% of LR-5 observations are hepatocellular carcinoma and about 98% are malignant overall; the positive predictive value for HCC is noted to fall in patients with a concurrent extrahepatic malignancy.	okfonte radiologyassistant.nl LI-RADS page, section 'LI-RADS 5 - definitely HCC'
LR-M	Probably or definitely malignant, not HCC specific Probably or definitely malignant but not specific for hepatocellular carcinoma. Features include a targetoid appearance (rim-like arterial hyperenhancement, peripheral washout, delayed central enhancement) or non-targetoid features such as infiltrative growth, marked diffusion restriction, or necrosis.	The page notes a diagnostic biopsy can be considered when the differential lies between HCC and another malignancy.	Per the page, about two-thirds of LR-M observations are non-HCC malignancies such as intrahepatic cholangiocarcinoma or combined HCC-cholangiocarcinoma, and about 5% are benign.	okfonte radiologyassistant.nl LI-RADS page, section 'LR-M - malignant'
LR-TIV	Tumor in vein Tumor in vein: unequivocal enhancing soft tissue within a vein, whether or not an associated parenchymal mass is visible. Supporting clues include an occluded vein with ill-defined margins, diffusion restriction within the vein, and vein expansion.	The page states LR-TIV is a contraindication to liver transplantation.	Per the page, venous tumor invasion is almost always related to hepatocellular carcinoma.	okfonte radiologyassistant.nl LI-RADS page, section 'LR-TIV - tumor in vein'

Referências cruzadas

fronteira compartilhadaBI-RADS. Breast Imaging Reporting and Data System, 5th editionShares the ACR Reporting and Data System framework that BI-RADS established.

Histórico de versões

Data	Evento	Detalhe	Situação
2018-07-01	revised	LI-RADS CT/MRI v2018 released, updating v2017. evidência	confirmado

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