Parathyroid adenoma presenting with multiple Brown tumors in an adolescent patient.

Parathyroid glands are endocrine glands that secrete parathyroid hormone (PTH) and regulate calcium-phosphor metabolism. The overexpression of PTH is called hyperparathyroidism (HPT), and is classified as primary, secondary, and tertiary. Primer HPT (PHPT) is the most common cause of parathyroid adenomas (80%-85%). Development of juvenile PHPT during adolescence is rare. The incidence of bone lesions in all age groups is reported to be 10%-20% in the patients with PHPT, and 5% in patients with juvenile PHPT. In patients with bone lesions, regression occurs in lesions after parathyroidectomy. In this case report, we aimed to present the imaging findings of long bones and left fifth metacarpal bone multiple Brown tumors, which is a rare presentation of parathyroid adenoma in adolescent patient and regression after parathyroidectomy.