Fig. 4

In a 67-year-old male with history of AP, following ineffective trans-duodenal drainage and stent loss, MDCT (a, b) showed reappearance of a fluid-containing collection (*) in the lesser sac with some nondependent air, suspicious for superinfected WOPN. Note biliary stent in place. Transferred to our hospital, endoscopic retreatment included cystogastrostomy and necrosectomy (c) with positioning of a plastic pigtail through the metal stent (thick arrows) in follow-up MDCT (d, e), a MPD stent (in maximum-intensity projection MIP E) and achieved rapid decrease of the collection. Ultimately, the metal stent was lost and the distal tip of the pigtail fell outside the incompletely collapsed collection (* in f)