Infection can cause enlarged lymph nodes. Relatively benign, non-cancerous, diseases such as sarcoidosis can also cause this. Sarcoidosis is a disease that causes small clusters of inflammation, called granulomas. The granulomas can occur in any area of the body, but are most often found in the lungs, lymph nodes, eyes, and skin. Typically sarcoidosis effects only the lungs. To know for sure your father will probably need a lymph node biopsy. Please read our Sarcoidosis MedFact at http://www.nationaljewish.org/medfacts/sarcoid.html for more detailed information.
I'm happy to report that his CTscan came back NORMAL! Thank you for replying. :)