After the patient gave informed consent, endoscopic drainage by the unroofing technique was performed. First, the top of the mucosa with spilling pus was incised, measuring 2.0 cm, by use of a needle-knife in the pure cut mode, and, subsequently, pus began to flow out. Then, lavage of the submucosal abscess cavity was per- formed with normal saline solution by use of an ERCP cath- eter (MTW Endoskopie, Wesel, Germany). Finally, a rat-toothed forceps was used to open the incision further to facilitate drainage. No pus was noted thereafter in the abscess cavity. The procedure took only a few minutes.
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