[Pulmonary metastasis from breast cancer: a case report with 19-year disease-free interval].

We report pulmonary metastasis from breast cancer in a 59-year-old female with 19-year disease-free interval. The patient had undergone a radical mastectomy for left breast cancer 19 years ago. Chest X-ray films revealed on abnormal shadow in left upper lung field. Further examinations including bronchoscopic lung biopsy suggested primary adenocarcinoma of the lung. A left upper lobectomy with mediastinal lymph node dissection was performed. The histological diagnosis of resected specimen was mucinous adenocarcinoma, suggesting pulmonary metastasis from breast cancer with 19-year disease-free interval. We reported our patient because of a rare case with distant metastasis after a long-term interval.