Severe bilateral pyramidal tract involvement in a patient with Parry-Romberg syndrome.

Parry-Romberg syndrome (PRS) is a rare clinical entity of unknown etiology, generally characterized by a slow and progressive atrophy that affects 1 side of the face. A variety of neurologic abnormalities have been shown to coexist with PRS. However, few studies regarding pyramidal tract involvement in this disorder have been reported. We report a unique case, in which the patient presented with bilateral pyramidal tract insult and an unusual sequence of disease onset and progression. This case suggests a rarer variant of PRS, and the neurologic findings indicate that the underlying essential neural degeneration may contribute to the processing of pyramidal tract insult or this syndrome.

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