Figure 2.

Endoscopic gastric fenestration technique. A: Closely connected walled-off necrosis (WON) and gastric wall lacking clear layers (black arrow, preoperative computed tomography scan); B: Compressive indentation of stomach by WON, with intense inflammation (orange arrow); C: Endoscopic ultrasound assessment and selection of fenestration site, abutment < 1 cm in combined thickness without clear layers (red arrow); D: Marking of prospective fenestration; E: Initial fenestration by endoscopic submucosal dissection; F: Penetration of WON capsule, releasing fluid content; G: Expanded fenestration; H: Self-healing of fenestration as seen by postoperative endoscopy (1 wk after endoscopic gastric fenestration); I: Narrowed area of initial fenestration; J: Enlarged expanded fenestration up to 3 cm; K: Necrotic tissue and exposed blood vessel in WON; L: Debridement of necrotic tissue.