The Value of Contrast-Enhanced Ultrasound-Guided Contrast Injection via the Endoscopic Nasobiliary Drainage Duct in Diagnosing Residual Common Bile Duct Stones

Figure 3

(a) The CEUS image became narrow at the end of the CBD consistent with the “bird’s beak sign.” (b) Saline injection revealed that the wall at the end of the CBD was thickened. (c) ENBD cholangiography showed a filling defect (narrow). (d) The results of surgical pathology revealed adenocarcinoma.

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