“…First, HCC contains numerous sinusoid-like vessels, and the fragility of these vessels may lead to hemorrhage and the formation of the epidural hematoma (3)(4)(5)(6)8,9). Second, coagulopathy caused by hepatic dysfunction may increase the risk of tumor bleeding (3,5,6,9). Third, the destructive growth of metastatic HCC may lead to the breakdown of the vessel structures in the peritumoral tissue, as demonstrated in osteolytic change (5,6,8).…”