Case Report: An unexpected and rare metastasis from lung adenocarcinoma in a male patient: a case report

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Background Breast metastasis from lung cancer is an extremely rare clinical event, particularly in men, and therefore remains poorly documented. Case presentation We report the case of a 45-year-old man with primary lung adenocarcinoma who subsequently developed a breast metastasis. He initially presented with spinal pain. Physical examination revealed cervical and supraclavicular lymphadenopathy. A whole-body computed tomography (CT) scan showed bilateral pulmonary nodules with mediastinal, supraclavicular, and axillary lymphadenopathy. Biopsy of the most accessible axillary lymph node confirmed adenocarcinoma of pulmonary origin. Chemotherapy was initiated. Ten months later, the patient developed a painless ipsilateral breast mass. Histological and immunohistochemical analyses confirmed the diagnosis of breast metastasis from lung adenocarcinoma. Conclusion Distinguishing between primary and metastatic breast carcinoma is essential because their treatment and prognosis differ considerably. Accurate diagnosis is therefore crucial for optimal patient management.

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