Synopsis
Characterise focal liver, pancreatic and renal lesions with organ-specific multiphasic imaging, separate simple benign appearances from indeterminate or malignant features, and direct each lesion to the correct specialist pathway.
- Characterisation asks whether a lesion contains fat, fluid, blood or enhancing tissue and how it behaves across phases; size alone rarely answers this.
- First identify organ, patient cancer and liver-risk context, symptoms, prior imaging and whether the study was adequately protocoled.
- Use contrast-enhanced MRI preferentially when a benign liver lesion is suspected, while CT provides rapid assessment when malignancy or complications are concerns.
Key red flags
Hypotension, falling haemoglobin or severe pain with a liver or renal mass suggests haemorrhage and requires urgent multiphase assessment.
Obstructive jaundice, pancreatic-duct dilatation, upstream atrophy or a solid pancreatic component requires expedited specialist evaluation.
Enhancing soft tissue in a cystic renal lesion, renal-vein extension or metastatic features raises RCC concern and needs uro-oncology review.
A new liver lesion in cirrhosis or known cancer follows a high-risk pathway rather than a generic incidental-lesion algorithm.
Solid component, mural nodule, main-duct change, obstructive jaundice or upstream atrophy raises concern for malignant or pre-malignant disease.
Renal sinus or perinephric extension, renal-vein thrombus, nodes and distant disease affect staging and treatment planning.
Rupture, haemorrhage, infection, duct obstruction or organ dysfunction requires acute assessment separate from long-term neoplastic risk.
Reasoning priorities
Assess arterial, portal and delayed enhancement and background liver.
A characteristic pattern may establish diagnosis; indeterminate lesions in high-risk liver require specialist pathways rather than generic follow-up.
Worked reasoning
A routine CT identifies an unexpected focal lesion that lacks a definitive benign pattern.
- Context: establish organ, symptoms, liver disease, cancer history, renal function, pancreatitis and hereditary risk.
- Reasoning: inspect whether fluid, fat, blood or enhancement is present and whether the original phase can answer the organ-specific question.
- Outcome: choose dedicated liver MRI, pancreatic CT or MRI-MRCP, or multiphasic renal CT or MRI and route to the relevant MDT if suspicious.
- Verification: compare prior images, document the final classification and ensure any surveillance or intervention has a named owner.