PTH and hypercalcemia disease: On admission to our center in July 2023, we observed a deterioration in calcium–phosphorus metabolism: PTH, 1,148 pg/ml (15–65); severe hypercalcemia, 4.04 mmol/L (2.15–2.55); and eGFR (CKD-EPI), 32 ml/min/1.73 m2.