Percutaneous transhepatic cholangioscopy and lithotripsy in treating difficult biliary ductal stones: Two case reports

Figure 5 The external percutaneous transhepatic cholangiography drain was converted to an internal-external drain (black arrow) 6 d following the original percutaneous transhepatic cholangiography. The obstructing stone (white arrow) is again seen in the same position as in Figure 2. The distal locking loop of the drain is left in the duodenum and thus permits entry of contrast into the small bowel.