[About a Case of Lewis-Sumner Syndrome Observed in Niger]

We report the first documented case of Lewis-Sumner syndrome observed in the Department of Neurology of the National Hospital of Niamey, Niger. It was a 53-year-old man with no known past medical history, who presented paresthesia on the right hand in the median nerve territory about 2 weeks after a flu-like syndrome. The symptoms progressed rapidly in two weeks with asymmetric sensitivomotor involvement of the 4 limbs with a predominance to the upper limbs. The electrophysiological study revealed persistent motor conduction blocks with a decrease in sensory amplitudes and sensory conduction velocities. Cerebrospinal fluid study revealed a proteinorachia at 0.4g/l with normal glycorachia without meningitis. After ruling out other systemic and infectious diseases that explains the clinical picture, the diagnosis of Lewis-Sumner syndrome has been established in the patient based on clinical and electrophysiological arguments. The patient was treated with intravenous immunoglobulins 0.4g/kg per day during 5 days with a good clinical response.