الفهرس 
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Abstract
Some non-neoplastic lesions may induce proliferation of immune
system cells and glial tissue, resulting in a spectral pattern similar to
neoplasms: (136)
1. Inflammatory pseudotumor.
2. Organizing hematoma.
3. Encephalitis secondary to herpes virus type 6.This is a subacute
encephalitis, in which there is a parenchymal lesion similar to an
infiltrative neoplastic process, associated with a marked increase in Cho
levels. Elevations in Cho levels in inflammatory processes likely arise
from gliosis. It is also common to observe increased mI levels that may
be used to distinguish encephalitis from a highgrade neoplasm.
Significant increases in Glx levels are also more characteristic of
inflammatory processes. (28)
4. Fulminate acute demyelination, group of patients with demyeliniating
diseasewho present with an acute or subacute focal neurologic deficit but
who may not develop multiple sclerosis in its full form. In cMRI, the
lesions of these patients tend to be single, large and with a mass-like
appearance. They may be submitted to biopsy, surgical excision, or even
radiotherapy because the pathologic analysis may mistakenly suggest
neoplasm. The distinction between a single acute demyelination plaque
and glioma is often a challenge. The spectral analysis of an acute plaque
could suggest neoplasm because an increase in lipids, lactate, and Choline
levels are observed. (28,137, 138)