Definite benign entities (examples):

• Cyst
• Hemangioma
• Vascular anomaly
• Perfusion alteration
• Hepatic fat deposition or sparing
• Hypertrophic pseudomass
• Confluent fibrosis
• Focal scar
• Observation that spontaneously disappears at follow-up

Comments:

• With few exceptions, the list of definite benign entities and probable benign entities is the same. The categorization as LR-1 or LR-2 depends on the level of certainty. 
• Observations with features diagnostic of a benign entity are categorized LR-1. 
• Observations with features suggestive of but not diagnostic of a benign entity are categorized LR-2. For example, an observation thought to be a benign entity but with atypical imaging features is appropriately categorized LR-2. 
• Observations with features equivocal for benign entities and that do not meet LR-4 or LR-5 criteria should be categorized LR-3. 
• LI-RADS v2014 does not list focal nodular hyperplasia (FNH) or hepatocellular adenoma (HCA) as examples of benign entities.
• Rationale: Although FNH-like lesions may occur in cirrhosis, they are rare and they are difficult to diagnose reliably by non-invasive imaging. HCAs are rare in cirrhosis.