A 71-year-old woman presented to our hospital because of a 10 mm nodule with a cavity in right lower lobe on chest computed tomography. Fluorodeoxyglucose-positron emission tomography showed slight accumulation in the nodule (maximum standard uptake value 2.08). Her serum carcinoembryonic antigen concentration was 5.4 ng/mL. Wedge resection of the tumor was performed for diagnostic and treatment purposes. Findings on intraoperative pathological examination of a frozen section were suspicious for adenocarcinoma. We, therefore, performed a right lower lobectomy and mediastinal lymph node dissection. Postoperative histological examination revealed a mucous gland adenoma. The patient’s postoperative course was favorable and she was discharged 7 days after surgery. Four months later, the serum carcinoembryonic antigen concentration had decreased to 3.1 ng/mL. Pulmonary mucous gland adenomas are rarely located peripherally. These benign tumors should be considered, even in the presence of high serum carcinoembryonic antigen concentrations or increased fluorodeoxyglucose uptake on fluorodeoxyglucose-positron emission tomography.

一名 71 岁的女性因胸部 CT 显示右下叶有一个 10 mm 结节而到我院就诊。氟脱氧葡萄糖-正电子发射断层扫描显示结节中有轻微的积聚（最大标准摄取值 2.08）。她的血清癌胚抗原浓度为 5.4 ng/mL。出于诊断和治疗目的，对肿瘤进行楔形切除。冰冻切片的术中病理检查结果怀疑为腺癌。因此，我们进行了右下肺叶切除术和纵隔淋巴结清扫术。术后组织学检查显示粘液腺腺瘤。患者术后病程良好，术后7天出院。四个月后，血清癌胚抗原浓度降至3。1 纳克/毫升。肺粘液腺腺瘤很少位于外周。即使存在高血清癌胚抗原浓度或氟脱氧葡萄糖-正电子发射断层扫描中氟脱氧葡萄糖摄取增加，也应考虑这些良性肿瘤。