We present a 78-year-old patient who suffered from symptomatic transitory p
sychotic syndrome after laparotomy. Persisting somnolence appeared with car
diopulmonary decompensation and gastrointestinal atony. Due to prolonged hy
percalcemia primary hyperparathyreoidism was diagnosed. Resection of a larg
e carcinoma of the parathyroids led to continuous clinical improvement.