Case Presentation: A 58- year-old female presented with vomiting, dizziness, and a blood pressure of 80/60 mmHg. Laboratory: serum creatinine 3.1 mg/dl (baseline 1 mg/dl), BUN 34 mg/dl (baseline 10 mg/dl), corrected calcium 12.3 mg/dl, low PTH , normal 25-OH vitamin D, and normal PTH-related protein. Two months prior, serum calcium was normal and 25-OH [...]