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要旨●胃の未分化型癌の代表である印環細胞癌は,従来H. pylori(Helicobacter pylori)による活動性胃炎を背景に萎縮境界の口側に好発するとされてきた.一方では近年,白色平坦なH. pylori未感染胃癌の報告が増加している.自施設で直近4年間に経験した,低分化腺癌成分を伴わない純粋な印環細胞癌連続30例の解析では,男女比はほぼ同数でうち12例はH. pylori現感染であり,いまだその割合が多いことが示された.かつ50歳未満が12例(現感染6例)に上り,現行の対策型内視鏡検診の弱点と考えられた.内視鏡像の検討から,その診断には萎縮境界近傍や幽門腺と胃底腺の腺境界領域に着目し,十分な空気伸展と,白色光を中心にIEEを併用し色調差に留意した観察が有用であった.
Signet-ring cell carcinoma has traditionally been described as occurring mainly on the proximal side of the atrophic border associated with chronic active gastritis induced by Helicobacter pylori(Hp). However, recent studies have increasingly reported white, flat, Hp-uninfected gastric signet-ring cell carcinomas. In our review of 30 consecutive cases diagnosed at our institution over the past four years, the male-to-female ratio was nearly equal, and 12 cases were Hp-positive, indicating that the prevalence remains substantial. Moreover, 12 cases(including six Hp-positive)were found in patients younger than 50 years, underscoring a possible gap in the current endoscopic screening system in Japan. Endoscopic observation showed that attention to areas near the atrophic margin and to glandular junctions between pyloric and fundic glands, together with sufficient air insufflation and detailed assessment of color variation under white light and Supplementary IEE, facilitated more reliable diagnosis.

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