Analysis of an 83-year-old male presenting with diarrhoea showed secretory diarrhoea. serum levels of gastrin and pancreatic polypeptide were elevated. Somatostatin-receptor scintigraphy revealed a hot spot in the left thoracic wall and subsequently, breast adenocarcinoma with neuroendocrine differentiation was diagnosed. Postoperatively, the patient made an uneventful recovery. The relationship between the
clinical picture, the results of pathological examination and hormonal analysis is discussed and put into perspective.