Peripheral neuropathy: pattern recognition for the pragmatist.

Long lists of causes of peripheral neuropathy make peripheral nerve disease a dry and uninspiring subject. A simple scheme based on the answers to just six questions should enable the clinician to recognise characteristic patterns, investigate relevant subgroups appropriately, and identify treatable disorders quickly: which systems are involved? What is the distribution of weakness? What is the nature of the sensory involvement? Is there any evidence of upper motor neuron involvement? What is the temporal evolution? Is there any evidence for a hereditary neuropathy? Standard screening investigations suffice for the common length dependent axonal neuropathies while complex presentations need more detailed investigations targeted to their clinical phenotype.