Your problem is not related to your cancer or to the surgery. They have nothing to do with your present condition. However, they are related to the I-131 treatment that you took. It is known to cause decreased saliva production in both parotid and submandibular glands in a small percentage of patients. This leads to thickened saliva leading to stones or sialolithiasis
, swelling of glands, retained secretions, dry mouth
. If the submandibular gland is just prominent and is not causing you any trouble otherwise (pain etc), then i would suggest you to ignore it. Also, since the CT scan
is normal, the likelihood of this being disease is remote. Other measures that you can take is to keep your mouth wet by using artificial saliva sprays. There is a possibility of stones forming in other salivary glands in which case they will have to be removed. Rest assured, it is not related to your disease.