<prompt> Treatment of Medullary Ca of thyroid with lymph node metastasisSub total thyroidectomy Radioiodine TSH supressionSubtotal thyroidectomy RadiotherapyTotal thyroidectomy RadioiodineTotal thyroidectomy Radiotherapy  <response>: .In medullary carcinoma thyroid , total thyroidectomy is treatment of choice. Radiotherapy can be considered in unresectable cases or after complete surgical resection in few cases. Note : Since medullary thyroid cancer doesnot arise from follicular cells, TSH suppression and RAI radio active iodine therapy have no role. Source : Sabiston 20th edition pg 910 