All of the following clinical findings are seen in Horner’s syndrome, except:
Ref: Harrison’s 18/e p 225
 
The triad of miosis with ipsilateral ptosis and anhidrosis constitutes Horner's syndrome, although anhidrosis is an inconstant feature. Brainstem stroke, carotid dissection, and neoplasm impinging on the sympathetic chain occasionally are identified as the cause of Horner's syndrome, but most cases are idiopathic.
Miosis
Anhidrosis
Heterochromia of iris
Apparent exophthalmos