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Schneiderian papilloma (SP) is classified into three types: inverted, oncocytic, and exophytic. Malignant transformation occurs in 10% of SP; most are inverted and oncocytic types. Malignant transformation of polypoid exophytic SP is exceptional; only two cases have been reported in the English literature. A 58‐year‐old man consulted our hospital because of nasal obstruction. Nasal endoscopy and imaging...
The author investigated histopathology of malignant changes of gastric foveolar hyperplastic polyps (GFHP). A total of 497 GFHP from 412 patients were retrospectively examined. Malignant changes were present in 11 GHP (2.2%). They were focal malignancies and well-differentiated adenocarcinoma without apparent invasion. In all the 11 GFHP, dysplastic glands were present in the vicinity of carcinomatous...
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