1684
CASE REPORT: A woman of 80 years, on long-term warfarin therapy presented with an acute dissecting thoracic aortic aneurysm; on investigation the only precipitating factor found was an international normalised ratio of 4.8.
 adverse event: presented 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: presented 