How do you manage parathyroid carcinomas with positive microscopic margins?

It seems that postoperative RT is indicated to help improve local control (based on small series from MD Anderson and Mayo Clinic). What areas should be treated? Just the tumor bed? Or should the neck be included? If so, what lymph node levels should be treated? What would the optimal dose be? The patient was presumed to have a thyroid nodule and underwent hemithyroidectomy with 2 negative perithyroid nodes and was found to have parathyroid carcinoma on final pathology.