Novel 7-mm-diameter double bare metal stent for endoscopic side-by-side stent placement in malignant hilar biliary obstruction

As palliation for malignant hilar biliary obstruction (MHBO), both endoscopic stent-in-stent and side-by-side (SBS) stent placement are similarly effective.1Lee T.H. Moon J.H. Choi J.H. et al.Prospective comparison of endoscopic bilateral stent-in-stent versus stent-by-stent deployment for inoperable advanced malignant hilar biliary stricture.Gastrointest Endosc. 2019; 90: 222-230Abstract Full Text Full Text PDF PubMed Scopus (43) Google Scholar An uncovered self-expandable metal stent is used during SBS in patients with MHBO to keep the intrahepatic biliary branch from being blocked. However, a disadvantage of using uncovered self-expandable metal stents is the increased risk of ingrowth. By superimposing 2 stents—a novel 7-mm-diameter double bare metal stent with a 6F delivery sheath (EGIS biliary stent braided 6; S&G Biotech Inc, Yongin-si, Korea) (Fig. 1)—a smaller cell size can be achieved, which might prevent ingrowth. This stent has 5-mm-long single bare portions at both distal ends, but the other central segment has an all double bare structure. A double bare stent has reportedly demonstrated longer patency, by preventing ingrowth, than a single bare stent in patients with malignant distal biliary obstruction.2Lee H.J. Chung M.J. Park J.Y. et al.A prospective randomized study for efficacy of an uncovered double bare metal stent compared to a single bare metal stent in malignant biliary obstruction.Surg Endosc. 2017; 31: 3159-3167Crossref PubMed Scopus (5) Google Scholar In addition, the 6F delivery sheath can be inserted into the bilateral lobe simultaneously, allowing for easier deployment in SBS placement.3Inoue T. Ishii N. Kobayashi Y. et al.Simultaneous versus sequential side-by-side bilateral metal stent placement for malignant hilar biliary obstructions.Dig Dis Sci. 2017; 62: 2542-2549Crossref PubMed Scopus (24) Google Scholar An 83-year-old man with MHBO due to inoperable cholangiocellular carcinoma was admitted to our hospital, and SBS stent placement with double bare metal stents was attempted. After the hilar stricture was evaluated in detail with cholangiography (Fig. 2), a 0.025-inch guidewire was placed bilaterally. After endoscopic sphincterotomy, each delivery sheath was advanced over the guidewire into the right and left hepatic ducts. Subsequently, stents (6 cm long) were individually deployed by careful adjustment of the distal ends of both stents at the same level above the ampulla. Thus, SBS stent placement was successfully performed without any adverse events (Video 1, available online at www.VideoGIE.org). A follow-up evaluation 10 months after the procedure indicated that the patient had not experienced recurrent biliary obstruction (Fig. 3).Figure 3Stents deployed in side-by-side fashion were fully expanded 1 week after the procedure.View Large Image Figure ViewerDownload Hi-res image Download (PPT) To the best of our knowledge, this is the first report of successful SBS stent placement by the use of double bare metal stents in a patient with MHBO. Because the potential advantage of this stent is not proven, additional cases are needed to validate our findings. However, this novel double bare stent designed for MHBO is expected to become a useful option for SBS stent placement because of its small cell size and thin delivery sheath. All authors disclosed no financial relationship. eyJraWQiOiI4ZjUxYWNhY2IzYjhiNjNlNzFlYmIzYWFmYTU5NmZmYyIsImFsZyI6IlJTMjU2In0.eyJzdWIiOiI2YjNhZjFmOTk1NzkyZGU1YjVhY2ExZTViNzlmMmI5YSIsImtpZCI6IjhmNTFhY2FjYjNiOGI2M2U3MWViYjNhYWZhNTk2ZmZjIiwiZXhwIjoxNjc3NzUyODA1fQ.nzEsz_eZ25pgEYAmv6Gd52FMvy_IykQbwDWZ9KchI8kkLVqTlkcS5yU9YKVhFQU-xh5H75r4AWRRFgexGL2zptiLgbGcIBHmQx0hMd9CfLo3PplTLAXePuP4m0ZWtPHCM_SdGLDAJcXu73_lkePuCn26YxwIgLuBHCwK0gbgjppBJAXFK3KDGq6rAz53kj79q8SmArfmoPIPaFiDjMVk3suBjG5otpgYIas1-B7Defb8T1jDuoD3_orfFrb9EvNm70tVYat-OOFnkZ4f05_gdzL9y16N9m2bnfzp0t-gAW-Pv0dAySX2hECqVTz_Px6z6Voc6_NUcGi7wCC1wklAfQ Download .mp4 (48 MB) Help with .mp4 files Video 1Endoscopic bilateral side-by-side stent placement with double bare metal stent in a patient with malignant hilar biliary obstruction.