Causes and diagnosis of sensory neuropathies: a review.

Sensory neuropathies are rare but unique peripheral neuropathies that involve only the peripheral sensory system. The diagnosis is made by both clinical and electrophysiological findings. Sensory neuropathies occur predominantly in women. The symptoms begin in the arms more often than the legs and occur asymmetrically. Pain and severe sensory ataxia in varying degrees are the main presenting symptoms. Definable causes of sensory neuropathies are hereditary, paraneoplastic, immunological, metabolic, infectious, and drug-induced disorders. In our experience, however, nearly half of all sensory neuropathies have been idiopathic. The clinical course of these sensory neuropathies is variable. The symptoms clearly worsened in 25% of our patients, but in the rest remained unchanged for many years, resulting in a poor functional prognosis because of intractable pain and ataxia. Most sensory neuropathies are resistant to any treatment. We review the electrophysiological features, laboratory findings, and nerve biopsy results in our patients and discuss in detail the potential underlying diseases included in the differential diagnosis.