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はじめに 気管支鏡検査の進歩およびCTの性能向上や3D構築画像処理の向上に伴い,気管支分岐異常が比較的容易に認識できるようになった.気管支分岐異常は,過剰気管支と転位気管支に分けられ,その出現頻度は0.6%程度とされている.転位気管支は,本来と異なる位置から分岐する気管支であり,右上葉気管支の転位がもっとも多く,全体の70%を占める.われわれは,転位気管支を伴う右転移性肺腫瘍の切除例を経験したので,若干の文献的考察を加えて報告する.
We experienced a resected case of metastatic lung tumor with a right displaced segmental bronchus (B1+3). The patient was an 82-year-old woman who had a history of surgery for transverse colon cancer. A chest computed tomography (CT) scan revealed a nodular shadow with an irregular margin (3.1 cm in diameter) in the right upper lobe, which was suspected of a primary lung cancer. Chest CT and bronchoscopy revealed B1+3 displaced segmental bronchus. Thoracoscope-assisted right upper lobectomy was performed for diagnostic and therapeutic purposes. The pathological diagnosis was a metastatic lung tumor from the transverse colon cancer.
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