Having horrible headaches, confusion, memory loss, etc.

7/23/12-Abnormal CT Scan:
IMPRESSION: Subtle abnormality within the white matter of the left
frontal lobe near the vertex. This finding is nonspecific but abnormal
for age. Differential considerations include ischemia of unknown
chronicity as well as a demyelinating process. Brain MRI imaging with and
without contrast would be the best means of further evaluation.

7/31/12-Normal MRI.

How is this possible? Does that mean nothing is wrong?