on microscopic examination , it consisted principally of 1 ) solid arrays or nests of fibroblast- and histiocyte-like cells , not infrequently containing varying amounts of intracellular hemosiderin or lipid , 2 ) focal areas of hemorrhage or hemorrhagic cyst-like spaces , sometimes occupying the major portion of the tumor , and 3 ) aggregates of chronic inflammatory cells , chiefly lymphocytes and plasmacytes , a feature that caused confusion with a lymph node metastasis in several cases .
C0016030
fibroblast
C0007634
cells