Abstract
肺原発リンパ上皮腫様癌（lymphoepithelioma-like carcinoma LELC）症例を経験したので報告する．症例は71歳 男性．S状結腸癌術後経過観察中に右肺下葉に1 cm大の腫瘍が発見された．結腸癌肺転移ないし原発性肺癌を疑い，右肺下葉切除＋リンパ節郭清術を行った．術後病理で上記診断を得た．LELCは本邦では稀な腫瘍である．発症にはEpstein Barr（EB）ウィルス感染の関与が示唆されているが，本例ではEBV-encoded RNA-1（EBER-1）in situ hybridizationは陰性，しかし抗VCA IgG抗体および抗EBNA IgG抗体は陽性で，過去にEBウィルス感染の既往を示す結果であった．
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