Thanks for writing in to us.
I would like to confirm that ultrasound
scan is the best investigation for your daughter right now. The fact that it is present for over a year shows that it in a benign swelling. However it should not be taken for granted because now she is feeling tingling
in her arms and fatigue
. It its in the neck, more central in location then we must suspect a thyroid
swelling. If it is more to a side then a lymph node becomes more likely. Rarely there may be other benign soft tissue
growths that can present likewise.
Hope this helps