Abnormal EMG and SSEP in a young child with an ependymoma.

We report our findings on a case of ependymoma in a one-year-old boy. A partial paresis of the left arm was found but the EEG and BAEP were normal. The EMG showed fibrillations and positive sharp waves in the paretic muscles and the SSEP showed a far field negativity. After removal of the cerebral process all neurophysiologic findings normalized. We discuss a hypothesis for the established clinical neurophysiological findings.