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JPY
Abstract
A 76-year-old man, who had underwent radiation for laryngeal cancer 5 years before, was pointed outabnormal pulmonary lesion on computed tomography. The 4.6 cm-sized lesion was seen in the upperlobe of the left lung. Endoscopic brushing cytology revealed adenocarcinoma. The patient was diagnosedas primary lung cancer of T2N0M0, clinical stage IB. Preoperative serum CA19-9 was elevatedto 250 U/ml, although other tumor markers were within normal limits. The patient underwent leftupper lobectomy with mediastinal lymph node dissection. Histologically, the lesion was diagnosed as welldifferentiated adenocarcinoma, mucinous subtype of bronchioloalveolar carcinoma (BAC) in WorldHealth Organization( WHO) classification. Immunohistochemistory shows positive for CA19-9 and thyroidtranscription factor-1(TTF-1)
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