II) BACKGROUND Endscopic Ultrasound (EUS) which consists of an endoscope containing a high frequency transducer, has become standard of care to evaluate gastrointestinal cancer as well as diseases included chronic pancreatitis. EUS with fine needle aspiration (FNA) has been demonstrated to be the least invasive and most effective means to acquire tissue in a number of situations included pancreas cancer and maligant lymph nodes. Endoscopic Retrograde Cholangiopancreatography (ERCP) is a therapeutic procedure used to manage choledocholithiasis, bile duct obstruction and occasional pancreatic ductal problems. Its diagostic uses are now more limited with the advent of EUS and cross sectional radiographic studies including CT and magnetic resonance cholangiopancreatography (MRCP).