Ipsilateral Horner syndrome indicates a cerebrovascular accident (CVA) occurring in the:

a. anterior portion of the pons.
b. internal or middle cerebral artery.
c. posterior inferior cerebellar artery.
d. vertebral or basilar arteries.


C
The posterior inferior cerebellar artery supplies the lateral and posterior portion of the medulla. A CVA involving this artery can produce a neurologic sign of ipsilateral Horner syndrome in the eye.

Nursing

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