A 71-year-old man underwent a computed tomography( CT) scan to check for prostate cancer metastasis. It revealed a lung tumor in the left upper lobe, and he was referred to our division. Under clinical diagnosis of primary lung cancer, left upper lobectomy was performed. Dense adhesion due to the history of tuberculosis was observed. On the first postoperative day, he complained of sudden numbness in his right arm during rehabilitation. The emergent contrast-enhanced CT revealed the right brachial arterial thromboembolism. We performed an embolectomy, and further analysis of the postoperative enhanced CT revealed a longer left upper pulmonary vein stump than usual. We thought it to be the cause of the thrombus formation and started anticoagulation therapy. The postoperative course was uneventful, without recurrence of thromboembolism.