Patients with severe traumatic brain injuries can go into a "vegetative" state, in which they're not aware of their environment or surroundings.

severity of long-term cognitive disfunction in patients with traumatic brain injuries

Depending on the severity and the location of the injury, it is possible for a patient with traumatic brain injury to make almost a full recovery and recover their cognitive abilities. 

The possibility of a full cognitive recovery in patients with traumatic brain injuries

Most patients show a long-term cognitive dysfunctions and disabilities no matter the severity of their traumatic brain injuries.

The treatment of TBI's cognitive dysfunctions depends on the location of the injury. Different locations causes different dysfunctions on the brain. 

importance of injury location in determining the treatment of traumatic brain injuries 

Torregrossa, W., Torrisi, M., De Luca, R., Casella, C., Rifici, C., Bonanno, M., & Calabrò, R. S. (2023). Neuropsychological Assessment in Patients with Traumatic Brain Injury: A Comprehensive Review with Clinical Recommendations. Biomedicines, 11(7), 1991. https://doi.org/10.3390/biomedicines11071991

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