Horner's syndrome secondary to internal jugular catheterization

We present three cases of people who developed Horner's syndrome following repeated attempts for catheterization of the internal jugular vein for hemodialysis. Any other neurologic finding or evidence of mass lesions in the neck or pulmonary apex could not be determined. Horner's syndrome should be considered a possible complication of percutaneous internal jugular vein catheterization for hemodialysis.