Horner's syndrome consists of which of the following clinical findings?

Horner's syndrome results from a lesion of the central or peripheral sympathetic nervous system and consists of miosis, mild ptosis, iris heterochromia and anhidrosis. The syndrome is caused by an abnormality or lesion to the sympathetic chain. The congenital variety is most commonly the result of bih trauma. Acquired cases may occur in children who have had cardiothoracic surgery, trauma, or brain stem vascular malformation. Anhidrosis can occur in both congenital and acquired cases. Congenital horner's syndrome is associated with heterochromia of iris with the lighter colored iris occurring on the same side as the lesion. Ref: CURRENT Diagnosis & Treatment: Pediatrics, 21e chapter 16.