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Unfixed, bivalved right kidney specimen
Macroscopic - Circumscribed, pale, rubbery, 100mm in diameter, in the upper pole of the right kidney. The tumour has a 'whorled' cut surface, reminiscent of a uterine fibroid.
Microscopic - Intersecting fascicles of smooth muscle cells with relatively uniform, 'cigar' shaped nuclei, eosinophilic cytoplasm and indistinct cell boundaries. Malignant features including mitotic activity, pleomorphism and necrosis are not seen.