Abstract

Introduction: Breast cancer remains to be the most frequently diagnosed cancer in woman accounting for more than 2 million cases per year where it can metastasize to several organs in the body with brain metastasis being one of the most dreaded sequelae of it. Whole-brain radiosurgery, with or without surgical resection, or stereotactic radiosurgery remains to be the predominant treatment modality whereby surgical resection is limited to cases having a sole lesion identified or when located in excisable cortical regions. Case description: We presented the case of a 71-year old female patient with history of Lobular carcinoma in situ triple positive with brain metastatic carcinoma with mucinous features consistent with breast origin while being in remission after she underwent bilateral mastectomies 6 years prior to presentation with negative PET scan for any lesion other than that in the brain. Conclusion: Finding of brain metastasis with pathological features discordant with primary pathology of breast cancer, in a patient who is in remission years after undergoing bilateral mastectomies raises the question of the histological differentiation between the metastatic lesion and the primary source at the cellular level, and reflects on the relationship with receptor expression be it PR, ER or HER2.

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