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1 Trauma is another important cause of brain lesions. 2  As mentioned before, trauma can either directly destroy brain tissues or can cause compression and delay of brain blood supply due to the formation of hematoma. 3  Sometimes inflammation causes brain lesions.
The exact mechanism by which brain atrophy occurs remains incompletely understood. Axonal loss within white matter lesions probably contributes to brain atrophy by two mechanisms: the amount of tissue lost within the lesions themselves, and Wallerian degeneration in pathways related to the lesions.