hi there, an enlarged lymphnode in the neck could be due to throat infectioon or ear infection
or infection any where in the head and neck area, but the thing that should be ruled out is any malignancy of the thyroid
gland. I would suggest that your get a FNAC of the lymphnode done to rule out thyroid problem or you can also get a thryroid radionuclide
scan done for the same. I would llike to know why did you get the thyroid ultrasound
in the first place? Do you have any thyroid problem or any family history of the same. Do get the lymph node evaluated. Take care.