Which of the following signs occurs in Horner's syndrome?
A. Drooping of the upper eyelid
B. Constriction of the pupil of the eye
C. Vasodilation of skin, with an absence of sweating on the ipsilateral side of the face and neck
D. Both A and B
E. A, B, and C
ANS: E
Rationale: If a lesion affects the sympathetic pathway to the head, then sympathetic activity on one side of the head is decreased. This reduction leads to ipsilateral drooping of the upper eyelid, constriction of the pupil, and skin vasodilation, with the absence of sweating on the ipsilateral side of the face and neck.
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