Abnormalities of nerve conduction and somatosensory evoked potential in Poland's syndrome.

We report a case of Poland's syndrome with associated primary generalized tonic-clonic epilepsy. Somatosensory evoked potentials at median nerve stimulation showed delayed latencies and reduced amplitudes of the evoked response from the hypoplastic right upper limb. Nerve conduction studies showed reduced mixed nerve conduction velocity in the right ulnar nerve and decrease in amplitudes of the compound nerve action potentials in the right median and ulnar nerves. We postulate a congenital hypoplasea of the above nerves and brachial plexus in the present case.