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要旨●患者は70歳代,男性.便潜血陽性のため施行された大腸内視鏡検査にて,S状結腸に15mm大の扁平な隆起性病変を認めた.病変の立ち上がりは粘膜下腫瘍(SMT)様で頂部には陥凹を認めたが,境界は不明瞭で明らかな蚕食像は認めなかった.病変全体に拡張した血管が目立つが上皮性病変を示唆する所見は認めなかった.同部位からの生検では,粘膜固有層内に核異型を伴う中型のリンパ球の密な集簇像がみられ,CD20,CD79aが陽性,bcl-2も広範囲に陽性,CD10,cyclin D1は陰性であり,MALTリンパ腫と診断した.本症例は局所根治目的にESDを施行し,切除標本においても免疫組織化学的にMALTリンパ腫に矛盾しない所見であった.切除断端陰性であり,術後再発なく経過している.
A 70s man underwent colonoscopy for positive fecal occult blood. A flat submucosal tumor-like lesion of 20mm in size was detected in the sigmoid colon. Biopsy of the same area confirmed MALT(mucosa-assisted lymphoid tissue)lymphoma. Positron emission tomography−computed tomography revealed no significant accumulation in the sigmoid colon and no other obvious distant or lymph node metastasis. These findings indicated colorectal MALT lymphoma Lugano International Classification Stage I. The patient underwent ESD(endoscopic submucosal dissection)for local cure, with full informed consent. Histopathological findings of the resected specimen revealed atypical lymphocyte aggregations within the mucosa-specific layer. Immunostaining revealed CD3(−), CD20(+), CD79a(+), CD10(−), and bcl-2(+)lymphocytes. This confirmed diagnosis of MALT lymphoma. The margins were negative. The patient has been doing well without any recurrence after the ESD.
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