169 Background: The accuracy of SpyGlass cholangioscopy (SGC) guided biopsy is only modest (60%) due to extrinsic lesion causing ductal stricture. Endoscopic ultrasound (EUS) can visualise the biliary tree and acquire tissue via fine needle aspiration (FNA). The aim is to evaluate the utility of EUS-FNA in patients who were referred for SGC for biliary strictures. Methods: The clinical impact of EUS-FNA was prospectively examined in 17 patients (10M; 56.2±1.9 yrs) who were referred for SGC to investigate difficult biliary strictures over 15 months. All patients had endoscopic retrograde cholangiography and biliary stenting with negative ductal brushing. Any mass lesion(s) or pathological node(s) found on EUS were biopsied. SGC and ductal biopsy were only performed if EUS-FNA could not provide a diagnosis. The results were compared to the surgical specimens or the positive histo-cytological findings from biopsies. Results: EUS examination was able to identify all ductal or peri-ductal abnormalities responsible for the biliary strictures, with sonographic diagnoses of cholangiocarcinoma (n=10), autoimmune pancreatitis (n=2), choledochocyst related stricture (1); pancreatic cancer (n=1), gallbladder cancer (n=1), Mirrizi’s syndrome (n=1) and colorectal metastasis (n=1). EUS-FNA was possible in 13 (76%) cases and provided tissue diagnosis in 9 (59%) patients, which can potentially avoid the need for SGC and cost saving of ~$ 48,000. SGC examination was successful in 7/8 patients, with 100% correct tissue diagnosis from Spybite biopsy (4 cholangio-carcinomas, 1 autoimmune pancreatitis, 1 biliary villous adenoma, 1 hepatoma, 1 high grade dysplastic choledochocyst). SpyScope intubation was not possible in a patient with long-standing primiary sclerosing cholangitis who had tight stricturing of the entire extra-hepatic duct. Overall, tissue diagnosis was established in 94% (16/17) patients. Conclusions: EUS able to detect 100% ductal or peri-ductal abnormalities responsible for biliary strictures referred for SGC. Together with FNA, EUS provides correct diagnosis and avoids the need for SGC in 59% of cases, resulting in significant cost saving but also improving the yield of SpyGlass guided biopsy.
Su1540 REVISITING THE DIAGNOSTIC YIELD OF ERCP BRUSH CYTOLOGY FOR INDETERMINATE BILIARY STRICTURES
