DIAGNOSIS OF PORTAL VENOUS INVASION BY PANCREATICOBILIARY CARCINOMA -VALUE OF ENDOSCOPIC ULTRASONOGRAPHY

Background: We evaluated the usefulness of endoscopic ultrasonography for detecting pancreatobiliary carcinoma and assessing portal venous i nvasion by carcinoma. Methods: Seventy-three patients with pancreatic carcinoma (54 patients) or bile duct carcinoma (19 patients) underwent endoscopic ultrasonography, transabdominal ultrasonography, computed tomography (CT), and angiography. All patients underwent tumor resecti on and histological examination for portal venous invasion. Results of endoscopic ultrasonography were compared with those of other imaging modalities. Results: Histopathology revealed portal venous invasion in 20 patients. Endoscopic ultrasonography was significantly more sensit ive (96%) than ultrasonography (81%), CT (86%), and angiography (59%) in detecting carcinomas. On endoscopic ultrasonography, loss of the ec hogenic vessel-parenchymal sonographic interface or a tumor within the vessel lumen indicated portal venous invasion. For diagnosing portal venous invasion, endoscopic ultrasonography was more sensitive (95%) a nd accurate (93%) than ultrasonography (55% and 67%), CT (65% and 74%) , and angiography (75% and 79%), respectively. Conclusion: Endoscopic ultrasonography is the most accurate tool for detecting pancreatobilia ry carcinomas and assessing portal venous invasion.