[Thyroid Storm Precipitated by Intracranial Surgery in a Woman with No History of Thyroid Disease.].

Severe medical stress can trigger thyroid storm, an endocrine emergency that affects consciousness. This case report describes a 43-year-old female patient transferred to our hospital with right motor hemipare- sis. Her medical history included untreated hyperten- sion, but no history of thyroid disease. Emergency magnetic resonance imaging (MRI)of the head revealed bilateral moyamoya disease and ischemic stroke in the right watershed region of the brain. The right superfi- cial temporal artery was anastomosed to the middle cerebral artery on day 71 of hospitalization due to repeated brain infarctions after admission. Although anesthesia was without incident, the patient gradually developed postoperative disturbed consciousness, hypertension and tachycardia, which we considered were the result of craniotomy or insufficient brain per- fusion, until a nurse found a swelling on the patient's neck. Hyperthyroidism was confirmed by laboratory data and an endocrinologist concluded that thyroid storm had caused her symptoms. Thyroid storm should be considered in the differential diagnosis of patients who present with disturbed consciousness after intracranial surgery.