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The presence of several histologically different neoplasms affecting the same organ is called collision tumor, an infrequent event of a difficult clinical diagnosis. Much less frequent is its occurrence caused simultaneously by both breast carcinoma and lymphoma in the same anatomic area, with very few cases described in the literature. We present the case of one patient with metastatic breast carcinoma with pleural, ganglion and hepatic clinical involvement, coexisting the lymphoma with carcinoma metastasis of breast origin in the very same lymph ganglion. The importance of this research lies on the exceptional nature of the case, noticed after a close revision of the literature, the complex diagnosis and its therapeutic and prognostic implications. [ABSTRACT FROM AUTHOR]

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