From the case:
Esophageal squamous papilloma
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H&E stain of an esophageal squamous papilloma.
There is a characteristic fibrovascular stalk with hyperplastic epithelium.
Case Discussion
By Patho (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons