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Usefulness of lavage cytology during endoscopic transpapillary catheterization into the gallbladder in the cytological diagnosis of gallbladder disease

Many studies have reported methods of cell collection involving percutaneous transhepatic cholangiodrainage (PTCD) and fine‐needle aspiration cytology for the diagnosis of gallbladder disease. However, few studies have described the use of a transpapillary approach, i.e., endoscopic transpapillary catheterization into the gallbladder (ETCG). In this study, we analyzed cells collected by ETCG to evaluate its usefulness in the cytological diagnosis of gallbladder disease.