A 76-year-old man presented with a subacute history of weight loss, malaise
and anorexia. Laboratory investigations revealed serially increasing hyper
calcaemia, correlating with deterioration in his clinical status. He was su
bsequently shown to have hypocortisolaemia, which improved with the adminis
tration of intravenous steroids. Subsequent biochemical testing revealed th
e endocrinological defect to be one of isolated ACTH deficiency, which, unl
ike Addison's disease, does not classically include hypercalcaemia in its p
resentation.