A 58-year-old man with cirrhosis undergoes imaging for hepatocellular carcinoma surveillance. The radiologist identifies a 2 cm lesion in the liver. Which hepatic segment is the most common site for HCC development in cirrhotic livers?

Explanation

## Most Common Site of HCC in Cirrhosis **Key Point:** Segment VIII (anterior superior segment of the right lobe) is among the most frequently reported sites for hepatocellular carcinoma in cirrhotic livers, along with Segment VII, owing to the larger volume and higher metabolic activity of the right lobe's superior segments. ### Anatomical Basis Segment VIII is located in the **anterosuperior aspect of the right hepatic lobe**, immediately below the diaphragm. In cirrhotic livers, the right lobe — particularly its superior segments (VII and VIII) — is disproportionately affected by HCC because: - The **right lobe constitutes ~60–65% of total hepatic volume**, providing a larger at-risk parenchymal mass - Segments VII and VIII receive a **dominant portal venous supply** and are exposed to higher concentrations of portal-borne carcinogens (e.g., aflatoxin metabolites, hepatitis viral antigens) - **Regenerative nodule formation** in cirrhosis is most pronounced in the right lobe, increasing the risk of dysplastic nodule → HCC transformation ### Segmental Distribution of HCC in Cirrhosis | Segment | Frequency | Reason | |---------|-----------|--------| | VIII (anterior superior) | Most common | Largest volume, high portal flow, dominant right lobe | | VII (posterior superior) | Common | Similar right-lobe hemodynamic exposure | | VI (posterior inferior) | Less common | Smaller volume, peripheral location | | I (caudate) | Rare | Separate dual blood supply; isolated from main portal flow | **Clinical Pearl:** The **right lobe (segments V–VIII)** accounts for the majority of HCC cases in cirrhosis. Among individual segments, **Segment VIII** is most frequently cited in hepatology literature (Sherlock & Dooley; AASLD guidelines) as the single most common site, reflecting its large volume and rich portal perfusion. **High-Yield:** For NEET PG/INI-CET: HCC in cirrhosis predominantly arises in the **right lobe**, with **Segment VIII** being the most commonly involved individual segment. Segment I (caudate) is the least common due to its unique dual venous drainage directly into the inferior vena cava. [cite: Sherlock S & Dooley J, Diseases of the Liver and Biliary System, 12e; Harrison's Principles of Internal Medicine, 20e, Ch 82]