Horner syndrome as an isolated manifestation of an intrapetrous internal carotid artery dissection.

PURPOSE

To describe the atypical localization and unusual clinical manifestation of an internal carotid artery dissection.

METHODS

We examined a 43-year-old woman who had sudden onset of left ptosis and miosis with vague dysesthesia around her eye.

RESULTS

Her examination showed an intrapetrous carotid artery dissection.

CONCLUSIONS

The intrapetrous segment is an extremely rare localization for an internal carotid artery dissection. The differential diagnosis of acute Horner syndrome should include carotid dissection, which is usually accompanied by other neurologic manifestations.