Opsoclonus in mumps and poliovirus type 3 encephalitides: a report of 2 cases.

Two adult patients with opsoclonus and tremor of the whole body associated with viral infections are reported. The first man presented with mumps (parotitis, orchitis and encephalitis). Paired serum mumps titers were both 1:80. The second patient had conjunctivitis and dizziness. Acute and convalescent sera showed significant rise of poliovirus type 3 titer. Clonazepam attenuated the symptoms in both patients.