Background: Diabetes insipidus is a rare disease which can be considered as a part of broad spectrum of preeclampsia manifestations.
Case presentation : A 39-year old primigravid woman, with an unremarkable past medical history, was admitted in the 33rd week of gestation for elevated blood pressure. On admission, her blood pressure was 140/90 mmHg and the only abnormal laboratory findings were trace proteinuria and elevated liver enzymes. During the following days her blood pressure rose to 150/100 mmHg with deterioration of clinical and paraclinical status of the patient characterized by excessive thirst, polydipsia and excretion of large amounts of diluted urine. Having considered the patient's aggravating status, termination of pregnancy was planned. Fortunately, all the clinical and paraclinical presentations, including those related to the probable diabetes insipidus disappeared on the second day of postpartum period.
Conclusion: Sign and symptoms of diabetes insipidus should be considered in all cases admitted for preeclampsia.