This protocol addresses the clinical scenario in which parathyroid adenoma presents with clinical or biochemical evidence consistent with parathyroid carcinoma, defined by markedly elevated parathyroid hormone (PTH) levels alongside severe hypercalcemia.

Clinical Scenario

Parathyroid carcinoma (PCA) should be considered in patients with primary hyperparathyroidism who have markedly elevated PTH levels and severe hypercalcemia. This distinct biochemical pattern shapes the surgical strategy required.

Approach (partial)

Management centres on a surgical intervention, where the extent and technique of resection are guided by intraoperative findings. The complete protocol — including the full decision algorithm — is available via the link below.

Treatment Goal

The target is reestablishment of normal calcium homeostasis (eucalcemia), with durable normocalcemia serving as the benchmark for successful outcome.

References

DOI: 10.1001/jamasurg.2016.2310

The diagnosis of PCA should be considered in patients with pHPT with markedly elevated PTH levels and severe hypercalcemia.
With intraoperative suspicion of parathyroid carcinoma, complete resection avoiding capsular disruption improves the likelihood of cure and may require en bloc resection of adherent tissues.
Parathyroidectomy is the only curative treatment for PCA.
Cure after parathyroidectomy is defined as the reestablishment of normal calcium homeostasis lasting a minimum of 6 months.

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Treatment of Parathyroid Adenoma with Severe Hypercalcemia and Markedly Elevated Parathyroid Hormone

References