Angie,
I just got back from my regular check-up, more than a year after my surgery, and my CT showed a "intensely enhancing submandibular gland, probably related to radiation therapy".
My doc thought so too. A quick google search showed that enhancement of salivary glands is related to post radiation.
My ENT and staff are very careful, but did not make a big deal about any of it, so I feel sure that this is what it is. I got an all clear from them. So yours could easily be the same.
They don't do PET scans routinely.
Best to you,
Anne


SCC tongue 9/2010, excised w/clear margins:8 X 4 mm, 1 mm deep
Neck Met, 10/2010, 1 cm lymph node; 12/21/'10: Neck Diss 30 nodes, 29 clear, micro ECE node, part tongue gloss, no residual scc
IMRT & 6 cisplatin 1/20/11-2/28/11 at MDA
GIST tumor sarcoma, removed 9/2011, no chemo needed
Clear on both counts as of Fall, 2021