A 58-year-old man with chronic hepatitis B and cirrhosis underwent right hepatectomy for a 7.2 cm hepatocellular carcinoma. The gross specimen is shown. The structure marked **B** represents a low-attenuation filling defect within the right branch of the portal vein extending towards the main portal vein bifurcation. Which of the following best describes the prognostic significance of this finding?

Question

Accepted Answer

C. Presence of macrovascular invasion, which classifies the tumour as BCLC stage C and is the single most important adverse prognostic factor in hepatocellular carcinoma. ## Why option 1 is correct

The structure marked **B** is a tumour thrombus within the right branch of the portal vein extending towards the main portal vein bifurcation. This represents macrovascular invasion (MVI), which is the hallmark of BCLC stage C hepatocellular carcinoma. According to Robbins and Cotran Pathologic Basis of Disease, macrovascular invasion is the single most important adverse prognostic factor in HCC, as it indicates systemic spread potential, increased risk of intrahepatic dissemination, and dramatically reduced overall survival. The presence of MVI fundamentally changes management strategy from curative-intent therapies (resection, transplantation, ablation) to systemic therapy, though selected patients with limited MVI (as in this case) may still benefit from resection combined with systemic therapy. The BCLC staging system explicitly incorporates MVI as a defining feature of stage C disease.

## Why each distractor is wrong

- **Option 2**: Microscopic satellite nodules are not visible on gross examination and are a feature of intrahepatic metastases, not macrovascular invasion. While they do indicate multifocal disease, they are not the structure marked **B**, which is clearly a vascular thrombus within the portal vein lumen.

- **Option 3**: Central haemorrhage and necrosis (marked **C** in the diagram) may occur in rapidly growing tumours but actually reflect areas of non-viable tumour. While this may reduce viable tumour burden, it does not carry the same prognostic weight as macrovascular invasion. MVI remains the dominant adverse prognostic factor regardless of necrosis.

- **Option 4**: Macronodular cirrhosis (marked **D**) is the background liver disease and does contribute to prognosis, but it is not the structure marked **B**. Furthermore, this patient had Child-Pugh class A cirrhosis and was deemed surgically resectable, so advanced decompensated cirrhosis was not the limiting factor in this case.

**High-Yield:** Macrovascular invasion (tumour thrombus in portal vein, hepatic vein, or inferior vena cava) is the single most important adverse prognostic factor in HCC and defines BCLC stage C disease—it mandates systemic therapy as first-line treatment.

[cite: Robbins and Cotran Pathologic Basis of Disease, 10th Edition, Chapter on the Liver]

Answer

A. Presence of microscopic satellite nodules in the cirrhotic parenchyma, which indicates multifocal disease and requires adjuvant transarterial chemoembolisation

Answer

B. Presence of central tumour necrosis and haemorrhage, which suggests rapid tumour growth but is associated with better prognosis due to reduced viable tumour burden

Answer

D. Presence of advanced cirrhosis with macronodular regeneration, which indicates hepatic decompensation and precludes surgical resection

Explanation

Why option 1 is correct

Why each distractor is wrong

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