[Horner's syndrome induced by internal carotid artery aneurysm--diagnostics and therapy].

Horner's syndrome is most frequently observed in the course of inflammatory, neoplastic and traumatic processes in the area of medulla oblongata, Gasserian ganglion and the lower part of brachial plexus. Horner's syndrome resulting from internal carotid artery aneurysm haemorrhage is very rare. A case of rapid appearance of Horner's syndrome initially treated as contrlateral exopthalmos has been presented. After several weeks headaches and neck pain accompanied Horner's syndrome on the same side. The CT-scan and cerebral angiography were normal. Repeated cerebral angiography with carotid arteries exhibition revealed an aneurysm on the extracranial part of the internal carotid artery. The aneurysm location was considered to be surgically difficult and thus endovascular treatment was applied (coiling). The regression of Horner's syndrome was observed 6 months after the treatment.