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A benign, asymptomatic kidney tumor arising from renomedullary interstitial cells. It is often found incidentally at the time of nephrectomy in adults. These tumors are either single or multiple and usually measure 1-10 mm in diameter. Microscopically the tumor cells are small, stellate, or spindled cells, embedded in a faintly basophilic stroma reminiscent of renal medullary stroma. (WHO 2016)
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