Serum prolactin level on admission was significantly elevated (2,484 ng/mL, 2.6-13.2), confirming a diagnosis of macroprolactinoma. Evaluation of anterior pituitary function indicated panhypopituitarism. Hypercalcemia, low serum phosphorus, and unequivocally elevated parathyroid hormone (PTH) level indicated primary hyperparathyroidism (PHPT). Here, PTH is linked to primary hyperparathyroidism.