@artew, welcome.

Regarding metabolic activity.
"A PET scan (positron emission tomography) works to identify areas of hypermetabolic activity anywhere in the body. A radioactive substance is given to the patient and this attaches to glucose, which is attracted to cells that are hypermetabolic. When the scan is done, these areas "light up." Often, but not always, cancer cells fall into this category of being hypermetabolic. In addition, not everything that is hypermetabolic is cancer."

The scan cannot differentiate between cancer cells or other situations like infection or inflammation that may be causing this activity.

Seeing test results before having a chance to talk to your doctor can be worrisome. Fellow patients here are not equipped to interpret the results of lab or imaging tests. In fact, it is only your doctor who can provide a correct reading since the PET scan is only one piece of the puzzle that will show the whole picture of what is going on.

Have you had other tests besides the PET scan? What symptoms led to your needing investigation? May I ask what stage of colon cancer you had 2 years ago?