1. Multiple areas of mildly decreased diffusivity without abnormal T2 signal, enhancement, or hemorrhage within white matter as described above. This is a favored to be due to early methotrexate-induced leukoencephalopathy. Findings of this exam are not consistent with infarction, or CNS involvement of lymphoma. Septic emboli as mentioned in the request for exam could have possibly this appearance, although it is felt much less likely due to lack of enhancement or T2 signal abnormality.
2. Normal perfusion.
3. No evidence of flow-limiting stenosis or aneurysm.