Lumen-apposing metal stents: A primer on indications and technical tips.

Lumen-apposing metal stents have ushered a new frontier for interventional endoscopic ultrasound. Initial use for the drainage of pancreatic fluid collections has rapidly expanded to the bile duct, gallbladder and small bowel. Intra-luminal applications for short strictures have also emerged. Electrocautery enhancement has made the stent delivery speedy. While the advent of lumen-apposing metal stents (LAMS) has brought a paradigm shift in the practice of interventional endoscopic ultrasound, their use is associated with certain technicalities that any advanced endosonologist should know. Understanding indications for LAMS is critical and their use in appropriate settings. Troubleshooting in tricky situations is always a challenge and the background considerations for their use include knowing the target organ, cautery and puncture technique, managing partially opened LAMS and also managing maldeployment. In this review, we discuss the intricacies and technical tips for the use of lumen-apposing metal stents.