Hello and hope you are doing well.
If its a pulsatile lump it could be a vascular tumor. Sometimes tumors of the thyroid could be pulsatile. It could also be lymph node resting on a vessel and you could be feeling the pulsations through it. Only a consultation with your primary care physician can help diagnose. If needed he may ask for an ultrasonogram of the throat.
Hope this helped and do keep us posted.