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要旨●患者は60歳代,男性.LSBE(C12M13)の右壁に1cm大の発赤調0-IIc型病変を認めた.他には発赤隆起・陥凹はなく,領域性のある発赤粘膜も認めなかったが,LSBE全体が粗糙で,ひび割れ様所見を認めた.0-IIc型部のNBI拡大観察では,軽度不整なvilli様構造を認め,高分化型腺癌と診断した.背景粘膜は平滑で,NBI拡大観察にて比較的整な表面構造を認めたことより,Barrett's esophageal adenocarcinoma(EAC),0-IIc,tub1,T1a-M,10mmと診断した.拡大内視鏡検査では,非腫瘍と診断した部位から採取した生検にてlow grade tub1が検出されたことから,内視鏡を再検し,さらに外側の非腫瘍と思われた5か所から生検を採取したところ,いずれもlow gradeのtub1であった.広範な病変であること,LSBEは異時多発癌の危険も高く,全Barrett粘膜の除去が望まれることから,胸腔鏡下胸部食道全摘術を行った.最終診断は4個の同時多発癌で,いずれもtub1,T1a-DMM,ly0,v0であり,N0,Stage 0であった.自験11例のLSBEに発生したEACでは本例のみが範囲診断が困難であった.その頻度は低いがLSBEには内視鏡診断が極めて困難なlow grade EACが存在することを念頭に置き,生検を併用した慎重な範囲診断が望まれる.
A 60-year-old male with LSBE(long-segment Barrett's esophagus ; C12M13)was referred for detailed examination. A 0-IIc lesion was found in LSBE using endoscopy. However, the lateral extension was unclear using white light imaging. NBI-ME(magnified endoscopy with narrow band imaging)showed an irregular villous pattern on the surface of the 0-IIc lesion, but the lateral extension was still unclear. A biopsy was taken from near the 0-IIc lesion to check the lateral extension and revealed low-grade adenocarcinoma.
A second endoscopy was performed for a further detailed examination. An irregular pit pattern was observed around the 0-IIc lesion using NBI-ME, but the lateral extension was still obscure. Therefore, five biopsies were taken from outside of the irregular pit area. However, all biopsies revealed low-grade adenocarcinoma. Therefore, esophagectomy was recommended for the patient, and thoracoscopic esophagectomy was performed.
The pathological diagnosis was synchronous adenocarcinoma(four lesions). All the lesions were well-differentiated adenocarcinoma, low-grade, T1a-DMM, and ly0/v0. According to our database, such a difficult case occurs less than 10% of the time. However, a detailed examination using NBI-ME with biopsies should be performed for the diagnosis of cases of esophageal adenocarcinoma in LSBE.
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