EUS uses a flexible endoscope (similar to a gastroscope) passed into the stomach via the mouth. The EUS scope has the addition of a tiny ultrasound probe on the tip which is used to acquire high resolution detailed images of the pancreas and other extra luminal structures (lymph nodes, bile ducts, mediastinum) lying only centimeters from the tip of the probe. Despite the advantages of EUS, image interpretation can be extremely challenging and in the presence of inflammation. Morphological changes of chronic pancreatitis seen at EUS have been classified according to the Rosemont classification; however, the findings are subjective with sub-optimal intra-observer agreement.