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Technical details of single-step EUS-guided transmural drainage. (A) Puncture was performed by using a 19-gauge needle, and a guidewire was inserted into the cystic cavity. (B) The puncture site was dilated with a balloon catheter. (C) A guidewire was inserted to insert another plastic double-pigtail stent. (D) Two double-pigtail stents with nasocystic tube were inserted.
