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Leydig Cell Tumor with Partial Regression

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The tumor cells have abundant eosinophilic cytoplasm, uniform round nuclei lacking atypia, and granules of lipofuscin pigment. At this magnification, they can be easily recognized as Leydig cells. A prominent fibrous component is fairly common in Leydig Cell Tumors; however, partial regression, as evidenced by peripheral scar formation in this case, is an unusual finding.

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