Tremor as the result of shunt obstruction: four patients with cysticercosis and secondary parkinsonism: report of four cases.

In four patients, shunt obstruction was accompanied by severe resting tremor involving principally the head, the jaw, the tongue, and the right upper extremity. Shunt revision resulted in improvement in each patient. Five similar patients have been reported. Although rare, the occurrence of parkinsonian tremor in a previously shunted patient suggests obstruction and requires prompt evaluation.