Mesenteric Adenopathy is a finding seen in many different cancer situations. Lymphoma can cause this, as well as other forms of cancer. Sometimes, infection/inflammation can lead to this finding as well. It is difficult to assess his prognosis without knowing exactly what is causing his adenopathy. Once a primary diagnosis is made, then the type of treatment and outcome can be better assessed. You should ask your oncologist if this is cancer, and what the primary source is.