Afton, a teacher for the past 25 years, spent Saturday and Sunday skiing in very cold weather. The following Friday, she got up to get ready for school and was shocked to find that the right side of...

Afton, a teacher for the past 25 years, spent Saturday and Sunday skiing
in very cold weather. The following Friday, she got up to get ready
for school and was shocked to find that the right side of her face was
drooping. She went to the emergency room, where tests could find no
evidence of a stroke or a tumor. A physician diagnosed the condition
and told Afton that it might be temporary. After about a week, her
condition improved. What disorder did the physician diagnose, and
what probably brought it on?