I have just completed my second partial glossectomy within 6 months (same area). Both were stage I with clean margins. Preop CT scans were clear of additional abnormal areas with the second one not even showing the soon to be excised area as abnormal. Surgeon, after presentation to his group, recommends radiation. Without a clear "target" I told him I would be looking for a second opinion.

Suddenly he says, "How about a PET scan?" What I can't understand is:
1. Why this diagnostic tool is not used more frequently.
2. Why I didn't have it after the second biopsy.
3. If it doesn't show additional cancer areas, why radiation would even be recommended.
4. What other questions I should be asking.

Please help with any info