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要旨●潰瘍性大腸炎(UC)患者では,通常の大腸上皮性腫瘍に加えて慢性炎症を背景とした大腸腫瘍が発生する.一般的に前者はsporadic neoplasia,後者はUC関連腫瘍(UCAN)と呼称されているが,両者の鑑別が困難な場合が少なくない.一方,近年,UCの上皮性腫瘍に対する内視鏡治療の適応が議論されている.現在のところ,内視鏡治療の適応として範囲が明瞭な低異型度病変が妥当と考えられているが,本邦多施設の登録研究の結果から,異時性再発病変の管理も重要な課題であることが示唆されている.
Patients with ulcerative colitis(UC)are at a high risk of developing UC-associated neoplasia(UCAN). Although conventional adenomas can also occur in patients with UC, they are referred to as sporadic neoplasia(SN), and it is difficult to distinguish between UCAN and SN. However, the indication for endoscopic treatment of epithelial neoplasms in UC has been discussed in recent years. Currently, low-grade dysplastic lesions with clearly defined borders are considered suitable candidates for endoscopic treatment. However, Japanese multicenter registry study suggests that metachronous recurrent lesion management is also a crucial clinical concern.

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