Stiff-man syndrome (SMS) is a rare disorder characterized by progressi
ve rigidity, stiffness, and spasms of axial and extremity muscles. The
etiology of SMS is unknown, but evidence suggests a possible autoimmu
ne basis. The recent successful use of intravenous immunoglobulin (IVI
G) in treating various autoimmune neuromuscular disorders led us to tr
y IVIG in an uncontrolled pilot study on three patients. All three sho
wed subjective and objective improvement.