<prompt> Tertiary hyperparathyroidism is-High PO4 level with metastasisSecondary hyperparathyroidism with CRFPrimary hyperparathyroidism with low Cam levelsSecondary hyperparathyroidism with chief cell adenoma  <response>: Davidson states In very small proportion of cases of secondary hyperparathyroidism continuous stimulation of the parathyroid may result in adenoma formation and autonomous PTH secretion. This is known as tertiary hyperparathyroidism. 