Endoscopic ultrasonography in patients with gastrinomas

Area of Science:

• Gastroenterology
• Medical Imaging
• Endocrinology

Background:

• Endoscopic ultrasonography (EUS) is a key imaging modality for pancreatic diseases.
• Primary endocrine tumors of the pancreas, such as insulinoma and gastrinoma, can be challenging to detect with conventional methods.
• EUS offers superior visualization of the pancreas from the stomach and duodenum.

Purpose of the Study:

• To highlight the diagnostic and localizing capabilities of EUS for pancreatic endocrine tumors.
• To describe the utility of EUS-guided fine needle aspiration for obtaining crucial diagnostic specimens.
• To discuss the application of EUS in managing extrapancreatic endocrine tumors and large pancreatic lesions.

Main Methods:

• Transducer placement in the descending duodenum, duodenal bulb, and stomach allows comprehensive pancreatic imaging.
• EUS-guided fine needle aspiration (FNA) for cytological and biopsy analysis.
• Integration of duodenoscopy, catheter echoprobe, and EUS for localizing small duodenal lesions.
• Endoscopic mucosectomy for gastroduodenal nodules and endoscopic tattooing for large pancreatic resections.

Main Results:

• EUS accurately diagnoses and localizes primary pancreatic endocrine tumors, including those missed by other imaging.
• EUS-guided FNA provides essential specimens for clinical decision-making.
• EUS may face challenges with small, flat extrapancreatic lesions, necessitating a combined endoscopic approach.
• Techniques like mucosectomy and endoscopic tattooing facilitate the management of specific tumor types and sizes.

Conclusions:

• Endoscopic ultrasonography is invaluable for diagnosing and localizing pancreatic endocrine tumors.
• EUS-guided FNA is critical for definitive diagnosis and treatment planning.
• A multimodal endoscopic approach enhances the management of complex pancreatic and duodenal lesions.