## Diagnostic Criteria for HCC — The Pitfall **Key Point:** The statement that AFP >400 ng/mL alone is diagnostic without imaging confirmation is INCORRECT. While elevated AFP is a useful marker, the diagnosis of HCC in cirrhotic patients requires integration of imaging, clinical context, and sometimes histology — not AFP level alone. ### Correct Diagnostic Approach According to international guidelines (AASLD, EASL), HCC diagnosis in cirrhotic patients is made by: 1. **Nodules 1–2 cm**: Require two imaging modalities (CT/MRI) showing arterial enhancement + washout, OR one imaging modality + AFP >400 ng/mL + clinical correlation 2. **Nodules >2 cm**: One imaging modality showing typical HCC appearance (arterial enhancement + venous/delayed phase washout) is sufficient 3. **Biopsy**: Reserved for nodules <1 cm or when imaging is inconclusive **High-Yield:** AFP >400 ng/mL is a *supportive* criterion, not a standalone diagnostic tool. It increases specificity when combined with imaging but cannot replace imaging in diagnosis. ### Why the Other Options Are Correct | Feature | Validity | |---------|----------| | **BCLC staging** | Incorporates tumor burden (size, number), vascular invasion, PS — gold standard for HCC staging and treatment allocation | | **Histological features** | Loss of reticulin, increased mitosis, trabecular/solid architecture are hallmark findings of HCC vs. dysplasia | | **Well-differentiated HCC vs. dysplasia** | Overlapping histology; clinical/imaging context essential for distinction | **Clinical Pearl:** A cirrhotic patient with a 3 cm nodule showing arterial enhancement and washout on CT is diagnostic of HCC *without* needing AFP or biopsy — imaging morphology is sufficient for nodules >2 cm. [cite:Robbins 10e Ch 20]
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