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━━ Background.We herein report a case of lung metastasis of sigmoid colon cancer presenting as a thin-walled cavity. Case. The patient was a 55-year-old female receiving follow-up after undergoing surgical resection for sigmoid colon cancer (SE, N0, P1, Stage IV) followed by seven months of chemotherapy with BV plus mFOLFOX6. A preoperative chest CT scan revealed a 8-mm thin-walled cavity in the left S6 that was initially diagnosed as a lung cyst. The cavity gradually increased in size to a diameter of 20 mm, with thickening of the cavity wall, three years after surgery. Thoracoscopic wedge resection was subsequently performed, and the lesion was diagnosed as metastasis of sigmoid colon cancer. Conclusions. Careful follow-up and proactive efforts to obtain a definitive diagnosis are necessary in patients with expanding thin-walled cavities. (JJLC. 2014;54:187-190) KEY WORDS━━Metastatic lung cancer, Cavity, Colon cancer Received May 8, 2014; accepted June 8, 2014. 要旨━━背景.薄壁空洞性所見を呈する S状結腸癌肺 転移の 1例を経験した.症例.55 歳女性.2008 年 9 月, S状結腸癌(SE,N0,P1,Stage IV)に対し S状結腸切 除術を施行後,化学療法(BV+mFOLFOX6)を 7か月 間行い経過観察中であった.術前の胸部CTで,左 S6 に直径 8 mm大の薄壁空洞性病変を認めたが肺嚢胞と診 断していた.しかし空洞性病変は徐々に増大傾向を示し, 術後 3年目には直径 20 mmに増大するとともに空洞壁 の肥厚も認めるようになった.胸腔鏡下肺部分切除術を 施行したところ,S状結腸癌の転移と診断された.結語. 増大傾向を示す薄壁空洞性病変は,慎重な経過観察とと もに積極的な確定診断を試みる必要性があると考えられ た. 索引用語━━転移性肺腫瘍,空洞,大腸癌

A Case of Lung Metastasis Presenting as a Thin-walled Cavity