FCP2-347
A 25-year-old woman presents to the clinic with nausea, thirst and dehydration. She mentioned that she has an uncle with previous parathyroid gland excision and a cousin who has recently been diagnosed with insulinoma.
On examination, her BP is 135/72 mmHg, her pulse is 70/min and regular, her BMI is 20. Cardiovascular, respiratory and abdominal examinations are unremarkable.
Investigations show:
Hb 12.6 g/dl
WCC 5.4 x109/l
PLT 299 x109/l
Na+ 139 mmol/l
K+ 4.4 mmol/l
Creatinine 121 ىmol/l
Albumin 37 g/l
Ca++ 2.95 mmol/l
PTH 18 (normal<10)
Which of the following is the most likely cause of her raised calcium?