68-Ga-labeled Octreotide Analogues PET in Duodenal-pancreatic Neuroendocrine Tumours

Patients will undergo MDCT, PET and EUS. Every attempt will be made to achieve a pre-operative cytologic diagnosis of any primary lesion by EUS-FNA. All diagnostic tests (MDCT, PET, EUS) should be performed during a two month time span, in this fixed order. The nuclear medicine doctor will be blinded of findings of MDCT. The gastroenterologist will be blinded about the findings of MDCT and PET until he has completed the diagnostic EUS. For ethical reasons, the findings of MDCT and PET will be disclosed to her/him, while the patient is still sedated in the operating room, just before the FNA. The minimal technical requirement for the techniques, the requested levels of clinical competence of the operators and the procedure for critical revision of radiological and cytological and histological specimens are detailed in the protocol. For PET any 68Ga -labeled-octreotide analogue will be allowed. Before EUS, an extended-esophagogastroduodenoscopy (until the Treitz) until will be performed.