 This exam is to be done only before endoscopic ultrasound EUS. Patient will fast four hours before scan. 1 liter of water given orally 30 minutes prior to scan. An IV will be placed, and participant will have iodinated contrast Omnipaque 350 administered at 3-5mlsec. Post iodine scanning will be done with collimation of 0.6 x64mm and a pitch of 1.2 through the abdomen with scan delays of 40 and 70 seconds. 