Cerebellar Atrophy and Epilepsy
Significance of Cerebellar Atrophy in Intractable Temporal Lobe Epilepsy: A Quantitative MRI Study
*Evan K. Sandok, *Terence J. O'Brien, Clifford R. Jack, and *Elson L. So
Departments of *Neurology and Diagnostic Radiology, Mayo Clinic and Mayo Foundation, Rochester, Minnesota, U.S.A.
Summary: Purpose: To detennine the incidence of cerebellar atrophy (CA) in patients with intractable temporal lobe epilepsy, whether any clinical factors are significantly associated with CA, whether Cerebellar atrophy is unilateral or asymmetric and whether this feature has any relationship to the side of epileptogenicity, and whether the presence of CA is related to epilepsy surgery outcome.
Methods: We developed a magnetic resonance imaging method of measuring the presurgical volumes of the cerebellar hemispheres of 185 patients who underwent temporal lobec-tom y for intractable epilepsy and of 80 control subjects.
In addition, cerebellar volumes were normalized to the total brain volumes. CA was detennined as being present when the mea-sured volume was smaller than two standard deviations from the mean value found in control subjects.
Results: Both absolute and normalized cerebellar volumes were found to be significantly reduced in the epilepsy patients compared with the control subjects.