A CT scan of the middle abdomen showing a large tumor mass due to metastasis (spreading cancer) in abdominal lymph nodes. Update Date: 08/22/2008Shimul A. Shah, MD, Assistant Professor of Surgery, University of Massachusetts Medical School, Worcester, MA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.