Pseudobulbar palsy: a clinical computed tomography study.

61 of 1,590 (3.8%) patients with cerebrovascular disease showed suprabulbar palsy of the pure form (42 patients; 2 had autopsy) and striate form (19 patients; 3 had autopsy). 25 patients with the pallidopyramidal syndrome were included since the clinical picture bordered on the striate form. The pure variety was characterized by dysarthria, dysphagia and automatic voluntary dissociation of facial movements. Half of the patients also had hemiparesis, primitive reflexes and short-step gait. In the striate form, the main signs were dysarthria, dysphagia, automatic voluntary dissociation, rigidity and hypokinesia. Brisk tendon reflexes, primitive reflexes, short-step gait and mental deterioration were also present in half of the patients. The pure variety was caused by multiple infarcts and/or lacunae (85.7%), while the striate form had vascular lesions by computed tomography in only 36.8% of the cases. Histological findings, showing lipohyalinosis of the arterial wall leading to stenosis and occlusion of the lumen and tissue rarefaction and disintegration, support the assumption that microinfarctions, sometimes found only by histopathological examination, are the leading pathogenetic factor in this form. Hypertension, cardiopathy, smoking habit, dyslipemia and diabetes are the most frequent risk factors in both forms.