Vestibular decruitment in central nervous system disease.

The differential caloric test consisting of a weak and of a strong stimulation may provide evidence of certain vestibulo-oculomotor abnormality. The phenomenon of vestibular decruitment serves as an indication of central nervous system or intracranial pathology. A classification of the degree of decruitment was attempted in 139 patients exhibiting this phenomenon. Ample evidence is provided that vestibular decruitment is indicative of a variety of intracranial lesions predominantly in the posterior fossa. Decruitment was encountered with hypo- and hyperactive vestibular responses alike and also in patients in whom there was no deficit in end organ sensitivity. The armamentarium of neurotologic testing is enriched by the differential caloric stimulations providing an indication of the "site of lesion."