Abstract
1. When doing an electromyogram (EMG) on the left lower extremity and its related paraspinals, you find diphasic potentials with a large initial positive deflection spontaneously firing irregularly and confined to the lumbar paraspinal, extensor hallucis longus. and flexor digitorum longus muscles. EMG testing in other muscles in this extremity is normal. The left peroneal nerve conduction velocity is 46 misec below the fibular head and 48 misec across the fibular head. The most likely diagnosis is ( 1) S 1 radiculopathy (2) L4 radiculopathy (3) L5 radiculopathy (4) upper motor neuron disease (5) peroneal palsy
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