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The finding of a black thyroid gland is unusual and disconcerting. To our knowledge, this is the first study aimed at documenting the malignant potential of black thyroid glands. This report documents that the risk of malignancy is higher in black thyroid compared to non-black thyroid glands. Furthermore, among those with papillary thyroid cancer, the presence of the pigment did not correlate with malignancy, multifocality, or tumor size.

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