The nodule that is seen in ultrasound
can be lymphnode.
You do not mention the reason for thryoidectomy and what type of thyroidectomy
is done,whether total or partial?
If total thyroidectomy is done for cancer,then the lymphnode has to be evaluated.
Please get an FNAC(Fine needle aspiration cytology) of the nodule and confirm the diagnosis.
If it is not cancer,nothing to worry.
If it is cancer,further treatment has to be taken.
Wish you good health
If you come back with FNAC report,i will clarify further