Painless foot drop: an atypical etiology of a common presentation.

Pain Physician

Penn Spine Research Group, University of Pennsylvania Health System, Department of Rehabilitation Medicine, Philadelphia, PA, USA.

Published: October 2002

Weakness of the dorsiflexor muscles of the foot is a relatively common presentation. In most cases, the etiology involves a peripheral injury to the common peroneal nerve. These patients usually present with lower motor neuron findings on evaluation. In contrast, if upper motor neuron findings were present a central lesion should be suspected and appropriate imaging studies are performed. We describe a patient with painless foot drop and lower motor findings on examination that was diagnosed with multiple sclerosis. This case demonstrates that multiple sclerosis can masquerade as a peripheral process in some patients.

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