[Pulmonary metastasis from breast cancer 38 years after mastectomy; report of a case].

A 76-year-old woman with a history of radical mastectomy for cancer of the right breast 38 years previously developed a solitary right lung nodule which was a metastasis from breast cancer. Diagnosis of the cause of a solitary pulmonary nodule is usually difficult in a patient with a history of extrapulmonary malignancy. A solitary pulmonary metastasis from breast cancer with a disease-free interval of longer than 15 years has been quite rarely reported. We describe an unusual case of a solitary pulmonary metastasis from breast cancer 38 years after the initial treatment.