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From 1986 to 1998, 190 patients presented for first-time operations for sporadic, non-malignant, non-multiple endocrine neplasia primary hyperparathyroidism. Of these patients, 54% had been classified as "asymptomatic", 41% as symptomatic and 5% as acute. One hundred and thirty-five patients (71%) were referred to us for parathyroid surgery. Fifty-five patients (29%) were referred for thyroid surgery with hitherto unknown hyperparathyroidism. This corresponds to a prevalence of primary hyperparathyroidism of 1% in patients referred for thyroid surgery (5450 patients during the same period of time).
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