Background and study aims: The aim of this study was to assess the feasibility and efficiency of plasma argon trimming of gastrointestinal and biliary metallic stents. Patients and methods: A total of 31 patients underwent plasma argon trimming of their metallic stents (14 women, 17 men; mean ±SD age 73 ±12.2 years, range 46-96 years). Of these 31 patients, 24 had had covered or noncovered Unistep Wallstents placed in the biliary tract (13 patients with pancreatic neoplasms, five patients with Vater ampulloma, five patients with biliary tract carcinoma and one patient with chronic calcifiying pancreatitis); three patients had noncovered Enteral Unistep Wallstents (pyloroduoden- al); two patients with obstructive colorectal carcinoma had a noncovered Bard Memotherm stent inserted; and two patients had noncovered Ultraflex stents placed for esophageal carcinoma. Endoscopic trimming of the stents was performed under propofol-induced general anesthesia, with the power set at 70-80 watts and an argon flow of 0.8 liters/minute. Results: Complete and satisfactory trimming of the stents was possible, without complications (mean follow-up 15.8 months), in all patients except one, a patient with a covered biliary Wallstent. In 13 patients with biliary or Enteral Wallstents the trimming procedure was preventive. In eight patients with ulceration and/or hemorrhage (duodenal or rectal), healing was achieved after stent trimming and epinephrine (adrenaline) injection followed by electrocoagulation. Stent trimming restored patency of the duodenal lumen in six patients and of the esophageal lumen in two patients, and was done to allow insertion of a biliary stent in one patient whose duodenal stent was covering the papilla. In one patient with rectal tenesmus, stent shortening resulted in complete resolution of symptoms. Conclusions: Endsocopic plasma argon trimming of metallic stents is an efficient procedure which allows easy, reproducible and well-tolerated correction of complications that arise due to these prostheses. Background and research aims: The aim of this study was to assess the feasibility and efficiency of plasma argon trimming of gastrointestinal and biliary metallic stents. Patients and methods: A total of 31 patients underwent plasma argon trimming of their metallic stents (14 women, 17 men; mean ± SD age 73 ± 12.2 years, range 46-96 years). Of these 31 patients, 24 had had covered or noncovered Unistep Wallstents placed in the biliary tract (13 patients with pancreatic neoplasms, five patients with Vater ampulloma, five patients with biliary tract carcinoma and one patient with chronic calcifiying pancreatitis); three patients had noncovered Enteral Unistep Wallstents (pyloroduoden- al); two patients with obstructive colorectal carcinoma had a noncovered Bard Memotherm stent inserted; and two patients had noncovered Ultraflex stents placed for Endoscopic trimming of the stents was performed under propofol-induced general anesthesia, with the power set at 70-80 watts Results: Complete and satisfactory trimming of the stents was possible, without complications (mean follow-up 15.8 months), in all patients except one, a patient with a covered biliary Walls. In 13 patients with eight cases with ulceration and / or hemorrhage (duodenal or rectal), healing was achieved after stent trimming and epinephrine (adrenaline) injection followed by electrocoagulation. Stent trimming restored patency of the duodenal lumen in six patients and of the esophageal lumen in two patients, and was done to allow insertion of a biliary stent in one patient whose duodenal stent was covering the papilla. In one patient with rectal tenesmus, stent shortening resulted in complete resolution of symptoms. Conclusions : Endsocopic plasma argon trimming of metallic stents is an efficient procedure which allows easy, reproducible and well-tolerated correction of compl ications that arise due to these prostheses.