8th February 2024

A 27-year-old male presents with dyspepsia and coffee-ground vomiting.

A 27-year-old male presents with dyspepsia and coffee-ground vomiting. His dyspepsia has been ongoing for two years without relief from lansoprazole, ranitidine and antacids. Endoscopy has shown multiple duodenal ulcers, and these were treated. He reports watery diarrhoea associated with his dyspepsia for the same period. He has recently had a parathyroidectomy due to 2 parathyroid adenomas and previously had a pituitary adenoma surgically resected. 

Which cell type typically produces the hormone responsible for this condition?