<unk><unk><unk><unk>  is comprised of<unk><unk>  cells and varying amounts of small undifferentiated primitive neuroectodermal<unk>  (PNET)-like mesenchymal, and/or epithelial differentiated<unk>  cells. Gene involved in the pathogenesis of<unk><unk><unk><unk>  include SMARCB1 (hSNF5/INI-1), a<unk>  suppressor gene.<unk><unk><unk><unk>  may be associated with<unk>  predisposition syndrome. On gross pathology,<unk><unk><unk><unk>  is characterized by an encapsulated, grayish, friable mass which is moderately vascular. On microscopic histopathological analysis,<unk><unk><unk><unk>  is characterized by round blue<unk>  cells of high cellularity composed of<unk>  cells with eccentric nuclei, small nucleoli, and abundant amounts of eosinophilic cytoplasm with frequent mitotic figures.<unk><unk><unk><unk>  is demonstrated by positivity to<unk>  markers such as epithelial membrane antigen, vimentin, and smooth muscle actin.
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