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Vladimir Hachinski, MD, DsC(Med)
Department of Clinical Neurological Sciences The University of Western Ontario University Hospital PO Box 5339 London, Ontario Canada N6A 5A5

Arch Neurol. 1992;49(4):346.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.

—I have noticed that patients with corticospinal tract involvement of the upper limb when asked to extend their arms, palms facing each other, display an upgoing thumb sign as shown in the Figure. . . . [Full Text PDF of this Article]

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