Endoscopic retrograde cholangiopancreatography (ERCP) is the gold standard for the evaluation of biliary strictures and the management of bile duct stones. However, standard ERCP techniques sometimes fail for both indications. In such situations, peroral cholangioscopy (POCS), which allows direct visualization of the bile duct, can play a significant role in diagnosis and treatment. Direct visualization using POCS can help differentiate between malignant and benign conditions and is more accurate in defining the extent of cholangiocarcinoma. Furthermore, POCS enables visually guided biopsies. Certain types of difficult bile duct stones, such as impacted and intrahepatic stones, require POCS for visually guided lithotripsy. Recent advancements in POCS will broaden its applicability and improve its diagnostic utility. In this review, we provide perspectives on the past, present, and future of POCS.

Endoscopic retrograde cholangiopancreatography (ERCP) is the gold standard for the evaluation of biliary strictures and the management of bile duct stones. However, standard ERCP techniques sometimes fail for both indications. In such situations, peroral cholangioscopy (POCS), which allows direct visualization of the bile duct, can play a significant role in diagnosis and treatment. Direct visualization using POCS can help differentiate between malignant and benign conditions and is more accurate in defining the extent of cholangiocarcinoma. Furthermore, POCS enables visually guided biopsies. Certain types of difficult bile duct stones, such as impacted and intrahepatic stones, require POCS for visually guided lithotripsy. Recent advancements in POCS will broaden its applicability and improve its diagnostic utility. In this review, we provide perspectives on the past, present, and future of POCS.

Endoscopic retrograde cholangiopancreatography (ERCP) is the gold standard for the evaluation of biliary strictures and the management of bile duct stones. However, standard ERCP techniques sometimes fail for both indications. In such situations, peroral cholangioscopy (POCS), which allows direct visualization of the bile duct, can play a significant role in diagnosis and treatment. Direct visualization using POCS can help differentiate between malignant and benign conditions and is more accurate in defining the extent of cholangiocarcinoma. Furthermore, POCS enables visually guided biopsies. Certain types of difficult bile duct stones, such as impacted and intrahepatic stones, require POCS for visually guided lithotripsy. Recent advancements in POCS will broaden its applicability and improve its diagnostic utility. In this review, we provide perspectives on the past, present, and future of POCS.

Endoscopic retrograde cholangiopancreatography (ERCP) in patients with surgically altered anatomy is technically challenging. For example, scope insertion, selective cannulation, and intended procedures, such as stone extraction or stent placement, can be difficult. Single-balloon enteroscopy (SBE)-assisted ERCP has been used to effectively and safely address these technical issues in clinical practice. However, the small working channel limits its therapeutic potential. To address this shortcoming, a short-type SBE (short SBE) with a working length of 152 cm and a channel of 3.2 mm diameter has recently been introduced. Short SBE facilitates the use of larger accessories to complete certain procedures, such as stone extraction or self-expandable metallic stent placement. Despite the development in the SBE endoscope, various steps have to be overcome to successfully perform such procedure. To improve success, the challenging factors of each procedure must be identified. At the same time, endoscopists need to be mindful of adverse events, such as perforation, which can arise due to adhesions specific to the surgically altered anatomy. This review discussed technical tips regarding SBE-assisted ERCP in patients with surgically altered anatomy to increase success and reduce the risk of adverse events associated with ERCP.

Background/Aims: Endoscopic ultrasound-guided tissue acquisition (EUS-TA) using Franseen needles is reportedly useful for its high diagnostic yield. This study compared the diagnostic yield and puncturing ability of EUS-TA using 22-gauge cobalt-chromium (CO-Cr) needles with those of stainless-steel Franseen needles in patients with solid pancreatic lesions. Methods: Outcomes were compared between the 22-gauge Co-Cr Franseen needle (December 2019 to November 2020; group C) and stainless-steel needle (November 2020 to May 2022; group S). Results: A total of 155 patients (group C, 75; group S, 80) were eligible. The diagnostic accuracy was 92.0% in group C and 96.3% in group S with no significant intergroup differences (p=0.32). The rate of change in the operator (from training fellows to experts) was 20.0% (15/75) in group C and 7.5% (6/80) in group S. Stainless-steel Franseen needles showed less inter-operator difference than Co-Cr needles (p=0.03). Conclusions Both Co-Cr and stainless-steel Franseen needles showed high diagnostic ability. Stainless-steel Franseen needles are soft and flexible; therefore, the range of puncture angles can be widely adjusted, making them suitable for training fellows to complete the procedure.