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We report 3 cases of surgical resection for lung metastasis more than 15 years after initial surgery for breast cancer. Case 1: A 77-year-old woman was referred to our hospital because of a lung nodule in the left lower lobe detected in a computed tomography (CT) scan. She had undergone breast preservation therapy for breast cancer 15 years before the first visit. Left lower lobectomy was performed via video-assisted thoracoscopic surgery (VATS). The pathological diagnosis was lung metastasis of breast cancer, based on positive immunohistochemical staining of estrogen receptor (ER) and gross cystic disease fluid protein 15 (GCDFP-15). Case 2: An 88-year-old woman had undergone a mastectomy for breast cancer 23 years previously. A CT scan revealed a nodule in the upper lobe of the left lung. A wedge resection of the left upper lobe was performed. Because immunostainings for progesterone receptor (PgR) and GCDFP-15 were positive, the pathological diagnosis was metastasis of breast cancer. Case 3: A 78-year-old woman had undergone right mastectomy for the breast cancer 29 years previously. The patient was referred to our hospital because of a nodule in the right lung in a CT scan. Thoracoscopic right upper lobectomy was performed. The pathological diagnosis was lung metastasis of the breast cancer, with immunohistochemical positivity to ER, PgR, and focally to GCDFP-15. A differential diagnosis between primary lung cancer and metastasis of breast cancer on the basis of the findings of a CT scan is often difficult. It is important to obtain the previous clinical information about the breast cancer before VATS, even in patients with a long disease-free interval of more than 15 years.

Three Cases of Resection of Late Recurrence of Breast Cancer that Required Differential Diagnosis of Primary Lung Cancer