From question on page 1106

Endoscopic ultrasound showed the common bile duct on the left of the image as a linear hypoechoic structure. We noted a tubular non-shadowing structure, 5 mm in diameter, with a hyperechoic wall and a hypoechoic centre inside the common bile duct. The patient underwent endoscopic retrograde cholangiopancreatography (ERCP) (fig 2). The cholangiogram showed an intraductal linear …