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Afferent-loop syndrome (ALS) is known as a rare complication of partial or total gastrectomy and also occurs after pancreatoduodenectomy. The symptoms of ALS vary with the location of the mechanical obstruction, and the choice of therapeutic method should reflect the patient’s condition and disease state. Herein, we report the use of endoscopic ultrasound (EUS)-guided afferent loop drainage with a plastic stent and its reintervention for malignant ALS. An 80-year-old man was admitted to our hospital with abdominal pain. Thirty-two months before, the patient underwent left hepatectomy with choledochojejunostomy and Roux-en-Y reconstruction for hilar biliary adenocarcinoma. An abdominal CT scan showed a dilated afferent loop and a low-density lesion in the peritoneum that suggested recurrence of hilar biliary adenocarcinoma and malignant ALS due to mechanical obstruction of the afferent loop caused by peritoneal dissemination. The recurrence site did not include the choledochojejunostomy anastomosis and was far distal to it. We employed a convex EUS scope and directly punctured the afferent loop from the stomach. We inserted one double pig-tail stent, and the ALS immediately improved. Five months later, ALS recurred, and we exchanged a plastic stent through the fistula. After reintervention, ALS did not recur before the patient’s death due to cancer progression.

Afferent-Loop Syndrome Treated with Endoscopic Ultrasound-Guided Drainage of the Afferent Loop with a Plastic Stent