May 2018 — Anatomic Pathology
A 76-year-old man with a history of resected colonic polyps presented for follow-up colonoscopy. He was otherwise asymptomatic and in overall good health. Colonoscopy was unremarkable. The following pictures are haemotoxylin and eosin (H&E)-stained biopsies from the colonic biopsy and immunohistochemistry against Treponema pallidum.


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Kyriakos Chatzopoulos, M.D. Resident, Anatomic and Clinical Pathology Mayo Clinic |
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Audrey Schuetz, M.D. Senior Associate Consultant, Laboratory Genetics and Genomics Mayo Clinic Associate Professor of Laboratory Medicine and Pathology Mayo Clinic College of Medicine |