Definition:

Complete and unequivocal resolution of an observation present on a prior study. 

• Spontaneous disappearance: disappearance in absence of treatment

Comments:

• Observations that disappear spontaneously should be categorized LR-1 regardless of prior category.
• The reporting of such observations depends on the prior LI-RADS category:
• If previously categorized LR-4, LR-5, or LR-M: should be reported.
• If previously categorized LR-1, LR-2, or LR-3: may be reported at radiologist’s discretion.