[Ataxic instable Alajouanine-Akerman's hand: recovery of a semiologic sign].

It is aimed to recover, considering its historical value, a semiological sign described in 1931 by an eminent neurologist of Rio de Janeiro, together with a master of the French neurology. In the article by Alajouanine and Akerman, named "Attitude of the hand in an astereognostic monobrachial crisis of multiple esclerosis", a semiologic alteration was described which was characterized by "an instability in the attitude of the fingers, which is observed mainly with the hand extended in the attitude of swearing". This attitude of hand worsened a lot with the eyes closed and was accompanied by sensory ataxia, astereognosis, and impaired deep sensation in the affected member. From the original article, it is possible to consider at the present time the described semiologic alteration as a form of pseudoathetosis localized in the hand.