Morphological change of the tumor. A, The tumor was relatively well-circumscribed; the periphery may be the remaining blood vessel. B, Numerous spindle cells were arranged into sheets or swirling patterns. C, The spindle cells had marked cellular atypia, scattered multinucleated osteoclast-like giant cells were present amidst the spindle cells. D, The classic histological structure, the cords or nests epithelioid cells with intracytoplasmic vacuoles were focally present in extensive myxohyaline stroma.
Li et al. Diagnostic Pathology 2013 8:103 doi:10.1186/1746-1596-8-103