Table 3.

Differential diagnosis of Stiff-person syndrome.

Differential diagnosis driven by GAD† autoantibody positivity
✓ Cerebellar ataxia ✓ Epilepsy ✓ Myoclonus ✓ Neuromyotonia ✓ Batten's disease ✓ Limbic encephalopathy ✓ Myasthenia gravis
Differential diagnosis driven by clinical features
✓Myelopathy ✓ Tetanus ✓ Neuromyotonia ✓ Parkinsonism ✓ Primary lateral sclerosis ✓ Ankylosing spondylitis ✓ Leukodystrophies ✓ Neuroleptic malignant syndrome

GAD, glutamic acid decarboxylase.