Unusual peripheral neuropathies. Part I: extrinsic causes.

Peripheral neuropathy is common with many different etiologies. This is the first of three articles reviewing the less common causes of peripheral neuropathy. The first article includes the extrinsic causes of neuropathy including toxic/medications, infectious, nutritional, and systemic metabolic derangements. The second and third articles review the intrinsic causes of peripheral neuropathy. These reviews describe common presentations and constellation of manifestations and clinical findings.