Table 1.

LI-RADS classification for liver lesions

Non-rim arterial phase enhancement		Absent		Present
Observed size of lesion (mm)		< 20	≥ 20	< 10	10-19	≥ 20
Presence of additional major features	None	LR-3	LR-3	LR-3	LR-3	LR-4
Enhancing “capsule”	One	LR-3	LR-4	LR-4	LR-4/LR-5*	LR-5
Nonperipheral washout	≥ Two	LR-4	LR-4	LR-4	LR-5	LR-5
Threshold growth

^*If a lesion is classified in this category and has enhancing capsule, it is categorized as LR-4. However, if a lesion is classified in this category and has either nonperipheral washout OR threshold growth, it is classified as LR-5. LI-RADS: Liver Imaging Reporting and Data System