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Monoparesis, Monoplegia

Monoparesis is weakness, monoplegia complete weakness ("paralysis"), of a single limb. Monoparesis of the arm or leg of upper motor neurone type is usually cortical in origin, although may unusually arise from a cord lesion (leg more frequently than arm). Hoover’s sign and Babinski’s trunk-thigh test may be helpful in deciding whether monoparetic/monoplegic leg weakness is of nonorganic origin; the "arm drop" or "face-hand test" in arm weakness.
Peripheral disorders can sometimes present exclusively with single limb weakness, such as monomelic motor neurone disease (Hirayama disease), multifocal motor neuropathy with conduction block, and Guillain-Barré syndrome.