PTH and parathyroid gland carcinoma: The same authors [73] performed an analysis of published cases (from 1972 to 2020) and found 17 reports of parathyroid carcinoma in the pediatric population; total serum calcium varied between 12 and 20.7 mg/dL, and PTH levels were between 300 and 8638 pg/mL (the ages reported were between 8 and 16 years; the male to female ratio was 0.6; 60% of these children had palpable neck tumors; 50% of them displayed various bone complications; one out of five subjects had distant metastases, particularly pulmonary and lymphatic) [73].