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Localized hypertrophic neuropathy: a case report and review of the literature.

The case is presented of a 71-year-old man with a 6-year history of symptoms suggestive of carpal tunnel syndrome, which did not improve despite two surgical procedures. On further investigation, a fusiform enlargement of the median nerve was found above the elbow, which was found on biopsy to be localized hypertrophic neuropathy (LHN). This case is the first to be described affecting the median nerve. The literature regarding LHN is reviewed, with discussion of the differential diagnoses and possible etiology of this rare lesion.