EUS-guided Transmural Drainage of Walled-off Pancreatic Necrosis: Plastic vs Metallic Protesis.

Inclusion Criteria: * Age greater than or equal to 18 years * Patient with indication (ASGE, Jacobson BC, GIE2005;) of pancreatic collection drainage type WALLED-OFF PANCREATIC NECROSIS \* as a local complication of previous acute pancreatitis. * Patient trained to understand and / or sign informed consent * Patient who understands the type of study and will comply with all follow-up of complementary tests during its duration Exclusion Criteria: * Pregnancy or breastfeeding * Severe coagulation disorder: INR\> 1.5 not correctable with plasma and / or platelet administration \<50,000 / mm3 * Asymptomatic patients, with no clinical indication of drainage, except for those with vascular involvement due to compression (eg stenosis, splenic vessels with collateral circulation, and risk of bleeding) * Non-identification of solid content during the Endoscopic Ultrasound of the procedure * No informed consent * In the case of patients with mental retardation, without the ability to understand the nature and possible consequences of the study, except for the existence of a legal representative * Patients unable to maintain posterior follow-up (lack of adherence) * Situations that do not allow the practice of a high digestive endoscopy (eg, stenosis)