Hi, Thanks for writing in. Medullary cancer thyroid should be treated with a total thyroidectomy, unless there is distant metastasis at the time of diagnosis. Complete evaluation must be done to rule out spread of disease to other areas. Neck lymph nodes also need to be evaluated and operated during surgery. When cancer is limited to the thyroid gland, the prognosis is excellent. External beam radiotherapy and palliative chemotherapy are recommended in advanced disease. External radiation therapy has been used for palliation of locally recurrent tumors. Chemotherapy involves giving more than one medicine and this can help is stabilizing the tumor and preventing it from spreading fast. Please do not worry.