Sarcoid-like granulomas in primary renal cell carcinoma.

A case of renal cell carcinoma containing non-caseating epithelioid granulomas is described. These granulomas were indistinguishable from sarcoid granulomas microscopically. There was a clinical suggestion of sarcoidosis thirteen years prior to the excision of the tumour. The pathogenesis and significance of tumour-associated epithelioid granulomas are discussed.