Incidental Liver Lesions

Incidental Liver Lesions

Quick Reference Images

Incidental liver mass detected on CT flowchart — Incidental CT FlowchartClick to enlarge

Polycystic liver disease management flowchart — Polycystic Liver DiseaseClick to enlarge

Hypervascular liver lesion differential diagnosis — Hypervascular DDxClick to enlarge

Liver mass enhancement pattern algorithm — Enhancement PatternsClick to enlarge

Initial Triage

First question Known malignancy, cirrhosis, chronic hepatitis, or other HCC risk changes the pathway.

No cancer / no HCC risk

Many incidental lesions are benign: cyst, hemangioma, FNH, focal fat, or perfusional change.
Subcentimeter lesion with benign features usually needs no follow-up.
Indeterminate lesion on ultrasound or single-phase CT: characterize with contrast MRI or multiphasic CT.

Cancer or chronic liver disease

Lower threshold for dedicated multiphasic CT/MRI.
Cirrhotic or HCC-risk patients should generally use LI-RADS rather than this page.
Known cancer history: evaluate for metastasis if imaging features are not diagnostic benign.

Benign Patterns

No follow-up when classic

Simple cyst: water attenuation/signal, no enhancement, no solid component.
Hemangioma: peripheral nodular discontinuous enhancement with progressive fill-in.
FNH: arterial hyperenhancement, central scar when present, and typical hepatobiliary phase retention.
Focal fat or focal fat sparing in characteristic locations with no mass effect.

Polycystic liver disease

No cyst-related symptoms: usually no treatment or follow-up.
Symptomatic dominant cyst: aspiration/sclerotherapy or fenestration may be considered.
Diffuse severe symptomatic disease: specialty referral for medical, surgical, or transplant options.

Indeterminate / Suspicious

Hypervascular lesion

Benign possibilities: hemangioma, FNH, adenoma, perfusional phenomenon.
Suspicious possibilities: HCC in at-risk liver, hypervascular metastasis, cholangiocarcinoma, or mixed tumor.
Use arterial, portal venous, delayed, and hepatobiliary phase patterns when available.

Adenoma / suspicious mass

Hepatic adenoma management depends on size, subtype, growth, sex, and hormone exposure.
Lesions around 5 cm or larger, growing, hemorrhagic, or beta-catenin subtype often need specialty management.
If still indeterminate after high-quality imaging, consider short interval follow-up, multidisciplinary review, or biopsy.

Sources

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