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A 61-year-old man with hyperpigmentation

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Footnotes

  • Contributors SR conducted the histopathological analysis and wrote the paper. CB reviewed all the clinical and histopathological data with final check of the scientific content. TB collected all the clinical data and did the surgical operation.

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval Ethical Committee Local Hospital, Padova, Italy.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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