Median nerve ultrasonography in Parkinson's disease: a systematic review and meta-analysis.

Background: The cross-sectional area (CSA) of the median nerve in Parkinson's disease remains unclear.

Objectives: This meta-analysis assesses median nerve CSA changes in Parkinson's using ultrasonography.

Methods: PubMed, Web of Science, Scopus, and EBSCO were selectively searched for literature on Parkinson's disease, Median nerve, and ultrasonography.