You should see a thyroid (endocrinologist) expert who does their own ultrasounds. A biopsy is ultimately likely needed. The I-123 scan is not likely to add much -- even if "normal" would recommend pursuing further evaluation by a specialist.
This needs to have a biopsy. 90% of nodules are benign, but most nodules >1cm needs biopsy, particulary with the increase vascularity (blood flow). I-123 nuclear scanning is NOT indicated (unless the TSH blood test is low).
my blood test came back normal my doctor said on the ultrasound they couldn't tell if it was a nodule or not they could only see that it was a large solid mass he said it maybe a goiter so hes having me have a nucular scan