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We report on and discuss a case of a female patient diagnosed with breast cancer in 1996, which was histopathologically assessed as an invasive ductal carcinoma. The patient was admitted to our Department in 2017 with a liver metastasis of a neuroendocrine tumour. On admission she had no symptoms of an endo-crinopathy and was in a good general condition. Due to unknown primary site of the metastasis and given the patient's history of breast cancer, it was suspected that the breast cancer was in fact a neuroendocrine tumour. This hypothesis was confirmed by comparing histopathological specimens of the breast and liver tumours using advanced pathological methods.

Liver metastasis of a neuroendocrine neoplasm of unknown primary origin in a female patient with a history of breast cancer