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Oncocytoma : Calcified Stroma

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The stroma in oncocytomas can sometimes show patchy calcification (as seen here), calcospherites, osseous metaplasia, and myeloid metaplasia (Ref: Perez-Ordonez et al. Renal Oncocytoma: A Clinicopathologic Study of 70 cases. Am J Surg Pathol 1997 Aug; 21(8) 871-83.

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