Cancer invading the bone may show up on a plain film. If this is truly suspected, a bone scan or MRI would be needed.
If the liver enzymes are normal, jaundice is unlikely. If the CT scan is normal, it is unlikely that there is significant liver or gallbladder disease.
Although it is possible for colon cancer to arise within two years, the negative colonoscopy would make a new colon cancer less likely.
I would consider further imaging of the lumbar spine if the symptoms continue. Repeating the liver enzymes to ensure the bilirubin isn't elevated can be considered if jaundice is suspected.
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_