A Rare Case of Ectopic Adrenocorticotropic Hormone Secretion from Pancreatic Neuroendocrine Tumour Presenting with Cushing Syndrome

Ectopic adrenocorticotropic hormone secretion (EAS) from the pancreatic neuroendocrine tumour (PNET) is rare, aggressive, and challenging to treat. We hereby present a rare case of EAS from PNET presenting with Cushing syndrome diagnosed with endoscopic ultrasound-guided fine-needle aspiration cytology. This case highlights the advanced presentation of EAS from PNET with poor clinical correlation of hypercortisolism and the grade of PNET.