[Localization of enlarged parathyroid glands in hyperparathyroidism. Experiences with and role of computed tomography].

40 patients with primary hyperparathyroidism, 2 with and 38 without previous surgery had computed tomography (CT) and ultrasonography (US) preoperatively. CT correctly identified enlarged glands in 75%, US in 80%. In 7.5% US was correctly negative. In 12.5% CT has shown only a correct suspicion. Us was false positive in 2.5%, CT in 5%. US was false negative in 10%, CT in 7.5%.