[Primary hyperparathyroidism in intrathyroid parathyroid cancer]

Parathyroid carcinoma is a rare cause of hyperparathyroidism. Histological differentiation from parathyroid adenoma may be difficult and is rarely achieved intraoperatively. Parathyroid carcinomas are sometimes localized heterotopically. We report a case of parathyroid cancer in the left thyroid lobe. Surgical therapy should include en bloc resection of the tumor, the thyroid lobe and the parathyroid tissue.