Ascaris-mimicking common bile duct stone: A case report

Figure 1 A 72-year-old male with a distal common bile duct stone mimicking Ascaris. A and B: Coronal reformatted images of contrast-enhanced computed tomography showed a hyperattenuated, elongated lesion inside the distal common bile duct (CBD) lumen (arrows); C and D: A T2-weighted coronal image revealed a linear filling defect in the distal CBD lumen with mild ductal dilatation, findings that mimic an Ascaris worm; E and F: An elongated tubular filling defect was seen on endoscopic retrograde cholangiopancreatography, and a hyperechoic lesion with a central hypoechoic area was seen on endoscopic ultrasound; G: A dark-brown-colored CBD stone was discovered through endoscopic removal.

Figure 2 Timeline of the patient’s illness. CT: Computed tomography; CBD: Common bile duct; MRCP: Magnetic resonance cholangiopancreatography; ERCP: Endoscopic retrograde cholangiopancreatography; EUS: Endoscopic ultrasound.