Intraductal papillary mucinous tumor of the pancreas is a rare pancreatic cystic tumor which produces and accumulates massive mucin in pancreatic duct. We present a case of a 70-year-old man who suffers from repeated abdominal pain and is initially diagnosed as pancreatitis with pseudocysts. CT and ERCP show a severely dilated pancreatic duct with enhancing mural nodules. Thick mucin is aspirated out under CT guidance, which raises the suspicion of intraductal papillary mucinous tumor of the pancreas.