Acute complications are venous infarction and/or hemorrhage, subarachnoid hemorrhage, pulmonary thromboembolism, motor or language deficits, rapid progressive deterioration of mental status or coma, or in cavernous sinus involvement, Korsakoff-like amnestic syndrome with confabulation, bilateral temporal lobe infarction, inadequate antidiuretic hormone secretion, and blindness. This evidence concerns the gene AVP and Blindness.