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What is the differential diagnosis for the abnormal left mesial temporal signal?
The differential diagnosis for abnormal mesial temporal signal without enhancement on MRI is broad and includes infarction, HSV encephalitis, status epilepticus, low grade astrocytoma, gliomatosis cerebri and limbic encephalitis.
Subtle abnormal high T2 and DWI signal within the left mesial temporal lobe. No abnormal enhancement.