Abstract
Abstract Objective.—To elucidate the mechanism of interlobular fibrosis of the pancreas, which is categorized as chronic alcoholic pancreatitis. Methods.—Forty pancreatic tissue samples from patients with ampullary carcinomas, which cause various degrees of stricture of the main pancreatic duct, and 20 patients with chronic alcoholic pancreatitis were studied histopathologically and immunohistochemically. Results.—Fibrosis was observed in 23 of 40 patients with ampullary carcinomas and was classified into 3 categories: mild changes (10 cases), moderate changes (9 cases), and marked changes (4 cases). In the mild change cases, mild fibrosis was diffusely distributed in the interlobular areas, with scant immunoreactivity of anti–α-smooth muscle actin (α-SMA) and an expansive lobular appearance, whereas moderate and marked change cases showed interlobular and intralobular fibrosis with marked anti–α-SMA immunoreactivity and lobular atrophy. By quantitative analysis, the mild change cases showed both higher M...
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