Greetings,
The bone pain that you are having and the slight rise in your CEA is concerning and should be worked up as your oncologist is recommending. A recurrence of the cancer (with spread to the bones) is the first thing that must absolutely be ruled out and a CT scan is a good way to start. Another thing that they must have thought about and ruled out is a DVT (deep vein thrombus) in the leg with pulmonary embolism which happens quite frequently in patients with a history of GI cancer.
It souds like your oncologist is doing the appropriate work-up and I would follow his advice.
Sincerely,
Dr.Bernon
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