Introduction and importance:
Hepatocellular carcinoma (HCC) is a highly malignant primary hepatic tumor. However, extrahepatic metastatic sites of HCC with post-therapy dissemination of metastases mimicking primary soft tissue sarcomas with rib metastases are extremely rare.
Case presentation:
We report a unique case of HBV-positive HCC with bilateral lung involvement and widespread right-flank soft tissue and rib metastases. The pathological diagnosis after surgical resection confirmed extrahepatic HCC metastasis. Subsequently, adjuvanttargeted and immune-checkpoint inhibitor therapies were still initiated.
Clinical discussion:
Extrahepatic HCC metastasis, which initially presents at distant sites, is uncommon. HCC commonly metastasizes to the lungs, bones, lymph nodes, kidneys, adrenal glands, and peritoneum/omentum. HCC with aggressive post-scheduled adjuvant therapy to the lungs and hypochondriac soft tissue with rib metastasis is veray rare and has a poor prognosis.
Conclusion:
Although most patients with HCC have disseminated extrahepatic metastases, primary HCC should still be treated. Thus, a review of the history and imaging, histopathology, and immunohistochemical findings is crucial for the definite and differential diagnosis of this tumor.