Second generation optical coherence tomography: Preliminary experience in pancreatic and biliary strictures

Area of Science:

• Gastroenterology
• Medical Imaging
• Endoscopy

Background:

• Indeterminate biliary strictures pose diagnostic challenges.
• Optical coherence tomography (OCT) offers in-vivo, high-resolution microstructural imaging.
• Volumetric laser endomicroscopy (VLE) is a second-generation OCT system.

Purpose of the Study:

• To present preliminary data on the use of VLE for evaluating indeterminate biliary and pancreatic duct strictures.
• To assess the feasibility and diagnostic potential of VLE in this context.

Main Methods:

• 10 patients with indeterminate biliary or pancreatic strictures underwent endoscopic retrograde cholangiopancreatography (ERCP) and VLE.
• VLE imaging was performed in-vivo following ductal cannulation.
• Tissue sampling via cytology brushing was performed in all cases for histological correlation.

Main Results:

• VLE was successfully performed in all 10 patients (8 biliary, 2 pancreatic strictures).
• Histology confirmed malignancy (cholangiocarcinoma) in 3 patients and benign disease in 7.
• Distinct VLE features were observed for cholangiocarcinoma (epithelial thickening, hyper-reflective surface, layering effacement), PSC (onion skin layering), and benign strictures (clear layering, dilated hypo-reflective structures).

Conclusions:

• Preliminary findings suggest characteristic VLE imaging signatures for malignant, inflammatory (PSC), and benign biliary strictures.
• VLE may serve as a valuable tool for differentiating causes of indeterminate biliary strictures.