Pulmonary resection in metastatic breast cancer patients, apart from its potential therapeutic value, is also an important diagnostic tool, especially in patients with a suspected first recurrence, allowing for differential diagnosis with second primary lung cancers and benign lesions (19,20). The proportion of lesions proved not to be breast cancer metastases in various series ranges from 7% to 66% (9,14,18,21). As the morbidity and mortality of pulmonary resection has decreased substantially over the last decades, this potentially beneficial procedure can be discussed in a selected group of patients (9,19,21).