Re-intervention for stent–stone complex using intraductal cholangioscopy with electrohydraulic lithotripsy after multiple biliary metal stenting
22.März 2018 (eFirst)
A man in his 40s who had undergone right lobectomy for hepatocellular carcinoma, developed jaundice due to hilar biliary obstruction associated with recurrence of the cancer. Multiple metal stents were placed for the ventrolateral and dorsolateral segmental ducts, using a partial stent-in-stent method.
At 5 months after the procedure, jaundice recurred with intrahepatic bile duct dilation, and the patient underwent endoscopic re-intervention. However, the guidewire could not be inserted into the lumen of the previously placed metal stent. The distal stent end was found to be tapering ([Fig. 1]), and ingrowth with/without overgrowth was suspected, based on X-ray fluoroscopic findings.
Following insertion of a digital intraductal cholangioscope (SpyGlass DS; Boston Scientific Corp., Marlborough, Massachusetts, USA) into the bile duct, it was found that a stent–stone complex had formed at the distal stent end, and the lumen of the stent was completely obstructed ([Fig. 2]). Therefore, electrohydraulic lithotripsy was performed for the stent–stone complex. Thereafter, the lumen was visualized, and the guidewire was inserted under cholangioscopic guidance ([Video 1]).
Video 1 Stent–stone complex seen at the distal stent end on insertion of the digital intraductal cholangioscope into the bile duct. Electrohydraulic lithotripsy was performed, with subsequent visualization of the stent lumen. The guidewire was then inserted under cholangioscopic guidance.
Subsequently, stone fragments were removed using a balloon and basket catheter, and a stent was placed into the ventrolateral segmental duct. The patient’s symptoms and laboratory values showed improvement postoperatively, with no adverse events.
Recurrent biliary obstruction mainly occurs due to ingrowth/overgrowth after placement of uncovered metal stents for malignant hilar biliary obstruction   . Stent–stone complex is rare, but this might be related to difficulty in the diagnosis of radiolucent stones . In the present case, cholangioscopy was useful for the diagnosis, and appropriate re-intervention could be performed using electrohydraulic lithotripsy and guidewire placement under cholangioscopic guidance.
In summary, when the guidewire cannot be inserted into the stent lumen after placement of a metal stent, cholangioscopy should be considered, as stent–stone complex is one of the differential diagnoses.
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