Enlarged lymph nodes can be due to infection or possibly cancer. I agree with the antibiotic choice as well as the colonoscopy to rule out inflammatory bowel disease or colon cancer.
Repeating the CT scan should be done after the antibiotics are completed. If there continues to be lymph nodes, and the colonoscopy is negative for cancer or inflammatory bowel disease, a general surgery consult can be considered. This is done to consider biopsy of the lymph nodes to rule out lymphoma.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_