New precut sphincterotomy for endoscopic retrograde cholangiopancreatography in difficult biliary duct cannulation

Figure 1 Different MPSP precut methods (A-C).

Figure 2 Before precut down with needle knife (A, B) and after precut (C, D).

Figure 3 Before precut up with needle knife (A) and after precut (B).

Figure 4 Before Deng'S precut (A-C) and after Deng'S precut (D).

Figure 5 Precut with up-removal orifice technique (A, B) and after precut (C).

Figure 6 Before (A) and after precut (B) with bending endoscope technique (B).

Figure 7 Before (A) and after PDGC (B).

Figure 8 Before (A) and after comprehensive technique (B).