Histological features of this case. A: The neoplasm was demarcated from the surrounding liver tissues with relative clear boundary. B: The neoplasm showed a solid cellular growth pattern and dilated vascular channels. C: The cavernous-like vascular areas were composed of dilated vascular channels lined by monolayer flat endothelial cells, and separated by cellular septa. D: The solid cellular areas contained many capillaries with the narrow or collapsed lumen. E and F: The tumor was characterized by the infiltration of numerous inflammatory cells in the background, including small lymphocytes, plasma cells, and eosnophils. G and H: The cellular areas and the septa of cavernous-like vascular areas were composed of spindled and histiocytoid cells (arrow) with slightly eosinophilic cytoplasm and small central nucleoli. I: Mature adipocytes and thick-walled blood vessels were focally observed at the boundaries between the tumor and surrounding liver tissues.