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Such conditions as transient hemiplegia, monoplegia or aphasia may occur.

The paralysis may affect one side of the body—hemiplegia, or both sides—diplegia; less commonly one extremity alone is involved—monoplegia.

Paralysis of a single member or a single group of muscles is known as monoplegia and results from injury to the motor center or to a nerve trunk leading to the part that is involved.

In rare cases the whole motor area is destroyed—cortical hemiplegia; more generally the lesion affects one or more groups of muscles, and occasionally all the muscles of one limb are paralysed—cortical monoplegia.