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Thyroid-like Follicular Carcinoma of the Kidney

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Kidney_RCC_ThyroidLike1.jpg

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This is an exceedingly rare variant of renal cell carcinoma that mimics well-differentiated thyroid follicular carcinoma. It appears to be a low-grade tumor with most cases being discovered incidentally. The tumor shown here is composed of micro- and macrofollicles containing colloid-like eosinophilic material. The follicles are separated by moderate amount of stroma containing chronic inflammatory cells and cholesterol clefts.

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