Had an ultrasound exam which showed a Very Small thyroid on the right and left. Reason for this exam was due to feeling like something was in my throat all the time. When I ly on my left side I can feel it even more and sometimes have trouble breathing. The result was No nodules, cysts, lesions, and a very small thyroid. So small that the technician consulted with the physician. What causes this and what other tests should I ask about for the continued problem?