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nanuk's picture
Posts: 1363
Joined: Dec 2003

I'm reading posts by folks who are in the middle of their chemo protocol, and getting both CT and
PET scans..I'm not sure what the difference is, but my Onc reluctantly OK'd a CT scan after four
treatments, and says that PET results would be skewed by the chemo..(?) Can anyone address this seeming contradiction? Bud

shmurciakova's picture
Posts: 910
Joined: Dec 2002

Hi Bud. I had CT scans during chemo on two different occasions when my CEA fluctuated just to "be on the safe side" so to speak. My guess concerning the PET scan is that glucose can be taken up by any area of inflammation in the body, not only by cancer. As you know from our prior conversations, I had two small "non-specific" lung spots and was then given a PET scan to see if they could determine whether or not I was having a recurrence. My PET came back NED, however, the larger of the spots showed some uptake - although not what you would expect from cancer. In addition, my PET showed uptake at the area of the incision from my liver resection, in my throat, in my urinary tract, etc.etc.....My guess is that your doc. believes that the chemo would cause areas of uptake because of inflammations due to the chemo that are actually not cancer.? Just a guess based on my limited experience........I'm sure if you ask him what his reason is he would tell you...
Hope your feeling good! Susan

Kanort's picture
Posts: 1275
Joined: Jan 2004

Hi Bud,

I'm not sure why the contradictions, but my oncologist ordered my PET and CT scans because I had a chest XRay and the radiologist read that my one of my calcifications in my lower lung had increased in size. Of course, this caused a considerable amount of anxiety until both results proved negative. The CT scan is a much more reliable test than the chest Xray. I'm not sure why the radiologist thought that there was an increase in size of one of the nodules. Maybe I moved or something...who knows. I have been assured by three doctors that these calcifications were a result of an infection when I was young. Wishing you well and great test results!


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