A. <20mm

  • Masslike, arterial-phase hyperenhancement, with no Major Feature AND not definitely benign AND not probably benign
  • Masslike, arterial-phase hypoenhancement, with no or 1 Major Feature AND not definitely benign AND not probably benign
  • Non-masslike AND not definitely benign AND not probably benign
  • An observation that cannot be categorized as LI-RADS 1, 2, 4, 5 because of equivocal imaging features
  • An observation that meets criteria for LI-RADS 4 or 5 with stable imaging features for ≥ 2 years AND no increase in diameter for ≥ 2 years

B. 20mm or greater

  • Masslike, arterial-phase hypoenhancement, with no Major Feature AND not definitely benign or probably benign
  • Non-masslike AND not definitely benign AND not probably benign
  • An observation that cannot be categorized as LI-RADS 1, 2, 4, 5 because of equivocal imaging features
  • An observation that meets criteria for LI-RADS 4 or 5 with stable imaging features for ≥ 2 years AND no increase in diameter for ≥ 2 years