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Cancer in Situ in Pancreatic Squamous Metaplasia

Arch Surg. 1961;82(5):674-678. doi:10.1001/archsurg.1961.01300110036006.
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Although squamous metaplasia of the pancreatic ducts is not uncommon, being found in 9% to 64% of pancreases routinely examined at necropsy,1,2 squamous cell carcinoma of this organ is rare. Only 8 cases have been documented.3-8 Sommers and Meissner9 failed to encounter such a lesion in a review of 142 cases of pancreatic carcinoma, although 5 instances of adenocanthoma were observed. Lowry and associates7 and Lawrence6 noted squamous metaplasia of the pancreatic ducts in their solitary case reports of primary pancreatic squamous cell carcinoma, and they postulated that the tumor developed from areas of squamous metaplasia, although this transition was not demonstrated. Wolbach and Howe,10 in 1925, noted focal changes in areas of squamous metaplasia of pancreatic ducts in vitamin-deficient rats which changes they considered to be early carcinoma. Similar changes considered to represent in situ carcinoma in areas of squamous metaplasia have not


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