Figure 7
From: Metastatic disease to the breast: the Washington University experience
Sections of the left breast mass core needle biopsy specimen shown in Figure 5 were positive for synaptophysin immunostaining. Identical histological features were seen on the contralateral breast core biopsy specimen. The immunostain results suggested a neuroendocrine carcinoma, rather than a primary breast adenocarcinoma. Staging exams confirmed a lung primary.