Endoscopic retrograde cholangiopancreatography: A comprehensive review as a single diagnostic tool.

Endoscopic retrograde cholangiopancreatography (ERCP) was initially introduced in clinical practice as diagnostic tool. However, the presence of adverse events and the development of non-invasive techniques, such as magnetic resonance cholangiopancreatography (MRCP) and endoscopic ultrasound (EUS), limited its role as a stand-alone diagnostic choice, modifying its role to the leader of therapeutic pancreatobiliary endoscopy. Despite technological advances, there are still conditions where non-invasive diagnostic modalities are inconclusive, such as indeterminate biliary and pancreatic duct strictures, primary sclerosing cholangitis functional stenoses, intraductal papillary mucinous neoplasms (IPMNs) and paediatric indications, such as congenital anatomical abnormalities. This narrative review aimed to identify and analyse indications of diagnostic ERCP, without the need for therapeutic manipulations.