FIGURE 1. Endoscopic transoral/transmural drainage of WOPN. A, A guidewire is advanced and coiled within the necrotic collection. B, Puncture tract is dilated with an 18-mm wire-guided hydrostatic balloon via direct endoscopic and fluoroscopic guidance until waist was obliterated. C, Illustration of 7-Fr, pigtail nasobiliary tube positioned alongside transmurally placed internal pigtail stents into the WOPN to perform aggressive irrigation/debridement. D, Distal tip of nasobiliary tube (arrow) is crossing the spine to area of WOPN closer to the spleen.