Evaluatin of a Supratentorial Effect Remote from Brainstem or Cerebellar Lesion

An effect remote from supratentorial lesions to the cerebellum, the so-called crossed cerebellar diaschisis, has been widely reported. We used a single photon emission computed tomography to study supratentorial cerebral blood flow and search for the presence of any supratentorial remote effect from brainstem or cerebellar leision. In patients with cerebellar lesion, a sufficient increase of asymmetry index was seen in the cerebral cortex and thalamus. There was an especially significant correlation between the cerebellum and the thalamus in the grade of asymmetry and cerebellar index. But,quantitative data by a single photon emission computed tomography showed a symmetrical mild low cerebral blood flow. Our present findings demonstrated a supratentorial effect remotefrom cerebellar and brainstem lesion, and furthermore suggested that the thalamic pathway was closely related to the mechanism of this supratentorial remote effect.

Remote effect

Brainstem

Cerebellum

Single photon emmission computed tomography