Objective: Hepatocellular carcinoma (HCC) is the most common primary tumor of the liver with a potential of metastasis primarily to the lung, abdominal lymph nodes and bone. However, metastases to the costa, soft tissue are rare. Method: An 82-year-old man was admitted to hospital with weakness, anorexia. Chest x-ray and CT-scan demonstrated a 5×5 cm sized, intrathoracic mass on the lateral-side of the left 2.costa and also infiltrating the axillary soft tissues.A secondary mass with the identical radiological features was also detected within the C7-vertebra. Whole-body CT-scan was planned.A 2×2 cm sized nodular, hipodense mass was detected in the upper segment of the liver. Interestingly, none of these masses demonstrated a significant pathological FDG-uptake in the PET.A trucut biopsy was taken from the axillar. Microscopically, large tumoral nests were observed in connective tissues. Polygonal shaped tumoral cells were found to have granular cytoplasm, pleomorphic nuclei. Immunohistochemistry results: Positive cytoplasmic reaction with Heppar, TTF-1; canalicular staining with Polyclonal-CEA, CD10; weak cytoplasmic staining with pankeratin, B72.3; Negative reaction with Vimentin, AFP, CK7, CK20. Results: These histomorphological, immunohistochemical findings strongly supported to the diagnosis of HCC metastasis. Conclusion: HCC that is, in general, morphologically similar to mesenchymal and epithelial tumors, should be considered among the differential diagnosis of unknown primary tumors.