[Incidence of thyroid diseases in primary hyperparathyroidism]

The incidence of thyroid diseases was evaluated in patients with primary hyperparathyroidism subjected to parathyroidectomy. Eleven patients (26.8%) were affected in this way: 2 with carcinoma, 5 with nodular goitre, and 4 with adenoma. The possible reasons for associations of this kind are discussed, and it is suggested that their high frequency points to a relationship of cause and affect.