Unfortunately I have lost the clinical details of this patient, and all I have available is the results of a dural and brain biopsy, which is non-specific, suggests possible vasculitis, and importantly does not demonstrate any evidence of demyelination, which on imaging would certainly be a possibility. 

Histology

These biopsies are indicative of the inflammatory process, of chronic duration, that is not associated with an identifiable microbiologic agent such as acid-fast bacilli, fungi, or toxoplasmosis. The pattern of the inflammatory infiltrate that focally involves vessel walls may be a part of the spectrum of a vasculitic process, either primary or secondary. There was no evidence of a demyelinating disease process. Please correlate these findings with the results of microbiologic studies

Final Diagnosis

1. dura: no pathologic diagnosis; crushed (?lymphoid cells)
2. brain, leptomeninges and cortex: chronic leptomeningitis and possible vasculitis
3. brain, superficial and deep white matter: chronic encephalomyelitis