Although Eagle syndrome is thought to be caused by an elongated styloid process or calcified stylohyoid ligament, the presence of an elongated styloid process is not pathognomonic for Eagle syndrome because many patients with incidental findings of an elongated styloid process are asymptomatic.
CT is useful in that it provides complementary information to that provided by plain radiographic studies.
Please read the following articles for more information:
Surgical Treatment of Eagle Syndrome