Intention tremor and olivary enlargement: clinico-radiological study.

This study describes two patients who presented with intention tremor (IT) concomitant with olivary enlargement (OE), and discusses the relationship between these phenomena. Both patients had a vascular lesion in the brain stem, which subsequently caused IT and OE ipsilateral or contralateral to the site of the lesion, depending on the structures effected by the lesion. The results of our study suggest that damage involving the superior cerebellar tract, and central tegmental tract, or both, may result in IT and OE. However, IT and OE appear to have little physiological association, unlike the relation between OE and palatal myoclonus.