Between July 2002 and November 2009, 310 patients with primary hyperparathyroidism underwent ultrasound. Concomitant thyroid pathology was noted in 89 (29%) patients. Thirty-seven patients (42% of pathology) underwent fine-needle aspiration of a thyroid nodule. Thirteen patients (4% of all patients) underwent a thyroid operation not related to parathyroid disease: 9 thyroid lobectomies for presumably benign nodules and 4 total thyroidectomies for malignancy