Robert is a 16-year-old who woke up with a left-sided facial droop. He has no paralysis on his left arm or leg and is otherwise well. 

• What does the evidence suggest about the etiology of his condition?
• How should you manage this condition?
• What type of anticipatory guidance should you share with Robert and his parents?
• What can be confirmed medical diagnosis is?
• Differential diagnosis?
• diagnostic tests?