Rigidity in the setting of continuous motor unit activity at rest can be caused by a variety of central and peripheral conditions. A central origin is suggested by the presence of painful reflex spasms. Focal spinal lesions and infective causes are relatively easily excluded through imaging, microbiological and serological studies. There then remain a group of patients who may have the classical 'stiff-man syndrome' or a related syndrome. When strict diagnostic criteria are used, patients wit...Expand abstract
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The stiff man and stiff man plus syndromes.
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