Etiology of Cortical and White Matter Lesions in Cyclosporin-A and FK-506 Neurotoxicity

fig. 2. T2-weighted MR image (2500/84/2) obtained on the day of presentation shows typical areas of subcortical white matter abnormality without cortical involvement (arrows) in patient (case 2) who was conditioned for transplantation with cyclophosphamide and TBI and who presented with confusion and altered mental status 14 d after transplantation. She did not develop seizures. At the time of toxic reaction, she had grade 4 BMT-related TM and a CsA level within the normal therapeutic range. Her baseline blood pressure of 115/85 mm Hg increased to 167/104 mm Hg at the time of toxic reaction and MR imaging

fig. 3. MR images in a patient (case 14), conditioned for transplantation with cyclophosphamide and busulfan, who presented with new-onset seizure 176 d after transplantation. The patient had grade 3 BMT-related TM that rapidly progressed to grade 4. The CsA level was in the normal therapeutic range. His baseline blood pressure was 160/90 mm Hg, which increased to 170/110 mm Hg at the time of toxic reaction. The initial CT scan showed only nonspecific areas of low attenuation in the parietal region. MR images were obtained 6 h after CT.

A–C, T2-weighted MR images from the midventricular level and high parietal region (2500/84/2) show extensive high-signal-intensity edema involving the cortex in the frontal and parietal regions bilaterally (arrowheads).

D and E, Contrast-enhanced images corresponding to B and C show bilateral punctate enhancement in the cortex of the frontal region (arrows). These areas of enhancement correspond to the regions of cortical signal abnormality noted in B and C.

fig. 4. CT scans obtained at the time of toxic reaction shows areas of low attenuation extending centrally from the frontal lobe to the parietal region, involving the white matter and projecting to the cortical surface. Hemorrhages are noted in the right frontal lobe and right parietal area (arrows). The brain abnormalities are severe and appear to lie in a region that could easily coincide with the boundary between anterior cerebral and middle cerebral territories. Images were obtained in a patient (case 11), conditioned for transplantation with cyclophosphamide and busulfan, who presented with generalized tonic-clonic seizure activity 8 d after transplantation. At the onset of toxic reaction, the patient had grade 3 BMT-related TM that rapidly worsened to grade 4. The cyclosporin level at the time of toxic reaction was within the normal therapeutic range. Her baseline blood pressure was 110/70 mm Hg, which increased to 152/96 mm Hg at toxic reaction