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Case of the Week

History – These images are from a gastric biopsy of a pigmented lesion. The patient had no history of melanoma. What is your diagnosis?

Answer – Blue nevus of gastric oxyntic mucosa.

Comment - Blue nevi are quite rare in the gastrointestinal tract mucosa, but here is an example. The immunostain is a ki-67.

This case was provided by Dr. Elizabeth Montgomery, Professor of Pathology and Vice Chair of Anatomic Pathology at the University of Miami, and Editor-in-Chief of the Pathology Survival Guides at Innovative Science Press.

J Clin Pathol. 2020 Jul 6:jclinpath-2020-206757. doi: 10.1136/jclinpath-2020-206757. Epub ahead of print. PMID: 32631943.

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