PTH and Hypercalcemia: One of these patients (patient #4) presented to the emergency room with severe life-threatening hypercalcemia (calcium 5.0 mmol/L, PTH 27.8 pmol/L) and mental changes, was hospitalized in the intensive care unit and an ultrasound examination revealed a 6 cm mass in the right paratracheal area, as well as a mass in her right ipsilateral thyroid.