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Breast metastases from an adrenocorticotropic hormone secreting thymic neuro-endocrine tumor.

Metastases to the breast from non-mammary sites are rare and pose a diagnostic and therapeutic challenge. They can be mistaken for primary breast malignancy, which is much more common. In this case report we describe the clinical, radiological and pathological features of a patient who developed breast metastases from an adrenocorticotropic hormone (ACTH) secreting thymic neuro-endocrine carcinoma. Patient was initially felt to have a primary breast malignancy, however, after further ancillary testing a diagnosis of metastatic thymic neuro-endocrine tumor was made.