Welcome, and good work being persistent. I had Tonsil, BOT cancer with lymph node metastases that was confirmed by CT, FNAB, PET/CT, and direct biopsy.
1. I doubt it, unless they do a scan, see something suspicious or FNAB confirms. Also depends on tumor size, location of tumor like floor of mouth, which may spread differently than lateral tongue.
2. Maybe. I would want one. Chest x-yay too. Did your brother smoke.
3. Yes. They still can do a test if the tissue from biopsy was frozen, saved. Most
HPV, 90 percent, are in the oropharynx. If
HPV, they should look at the tonsil, BOT by endoscopy/triple scope.
Hope this helps.