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Breast metastases from extramammary neoplasms are very rare. Breast metastasis is often confused with primary breast malignancy. Accurate differentiation of metastatic breast carcinoma from primary breast carcinoma is of crucial importance because the treatment and prognosis differs significantly. The pathologist has a key role in making the diagnosis of metastasis to the breast when histological appearance is similar to primary breast tumor. The clinical history is helpful to make the diagnosis. Metastasis to the breast usually indicates disseminated metastatic disease and poor prognosis. We report a case of 42-year-old female who developed bilateral breast metastasis 18 months after the diagnosis of primary adenocarcinoma of lung.
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