## Why "Trabeculae 4–6 cells thick with loss of normal reticulin framework" is right The defining histopathological feature of hepatocellular carcinoma is the arrangement of malignant hepatocytes in trabeculae that are **4–6 cells thick**, in contrast to the normal liver architecture where trabeculae are only 1–2 cells thick. This thickened trabecular pattern, marked as **A** in the diagram, is accompanied by loss of the normal reticulin framework (marked as **B**), which is a hallmark of malignant transformation. According to Robbins 10e Ch 18, this architectural disarray is one of the most reliable microscopic criteria for diagnosing HCC, particularly in the setting of cirrhosis where the diagnosis can be made on imaging alone without biopsy. ## Why each distractor is wrong - **Single-cell-thick trabeculae with preserved reticulin architecture**: This describes normal hepatic architecture, not HCC. Normal liver maintains 1–2 cell-thick trabeculae with intact reticulin framework, which is the opposite of what is seen in malignancy. - **Solid sheets of hepatocytes without any trabecular organization**: While some poorly differentiated HCCs may show solid growth patterns, the classic and most common presentation of HCC is the thickened trabecular pattern. This option oversimplifies and misses the specific diagnostic criterion tested. - **Nodular pattern with central fibrosis and peripheral hepatocytes**: This describes the architecture of a regenerative nodule or dysplastic nodule in cirrhosis, not HCC. These benign lesions maintain normal or near-normal trabecular thickness and do not show the loss of reticulin framework characteristic of malignancy. **High-Yield:** HCC trabeculae are **4–6 cells thick** (vs normal 1–2); loss of reticulin framework is the architectural hallmark distinguishing malignancy from benign cirrhotic nodules. [cite: Robbins 10e Ch 18; Harrison 21e Ch 89]
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