Impact of mild traumatic brain injury on cingulate functions
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Updated: Jan 3, 2026
Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
Bernard François Michel1, Nathalie Sambuchi1, Brent Alan Vogt2
1Neurogeriatric Department, Sainte Marguerite's Hospital, Marseille, France.
Abstract:
Mild traumatic brain injury (mTBI) is a condition of normal neuroimaging, because conventional MRI is not sensitive to brain lesions. Neurocognitive deficits persist for years after injury in 15% of patients. Persistent TAI can continue after the trauma and contribute to progressive disability. Neuropathologic studies underestimate the total axonal damage, by failure to identify fine-caliber unmyelinated fiber. Swollen axons represent the "tip of the iceberg" of damage. Progression of molecular changes, including mitochondrial dysfunction, leads to secondary injuries. Primary low-intensity "invisible injury" is solely detectable at ultrastructural levels. Over the long term, mTBI is not a static event but a progressive injury, increasing risk of neurodegenerative diseases. Lack of evidence of brain injury has led to the development of more sensitive methods: morphometric MRI (VBM, DTI) and functional techniques (fMRI, PET, SPECT). By deformation of the surface of gray matter cingulate gyrus and disruption of long-coursing WM of CB structures, striking the falx, mTBI causes alteration of cingulate functions. Postconcussion, blast, and whiplash-associated disorders are the main mechanisms providing behavior and cognitive symptoms after mTBI.
Insights
Mild traumatic brain injury (mTBI) causes progressive, invisible damage not seen on conventional MRI. Advanced imaging reveals structural changes, highlighting mTBI
Area of Science:
- Neuroscience
- Neurology
- Radiology
Background:
- Mild traumatic brain injury (mTBI) often presents with normal conventional MRI, masking underlying pathology.
- Persistent neurocognitive deficits and axonal damage can continue years after the initial trauma.
- Conventional neuropathology may underestimate axonal damage, particularly fine-caliber unmyelinated fibers.
Purpose of the Study:
- To highlight that mTBI is a progressive injury, not a static event.
- To emphasize the limitations of conventional MRI in detecting mTBI-related lesions.
- To discuss the role of advanced imaging techniques in identifying subtle brain alterations.
Main Methods:
- Review of neuropathologic findings and limitations.
- Discussion of advanced imaging techniques like morphometric MRI (VBM, DTI) and functional methods (fMRI, PET, SPECT).
- Analysis of biomechanical mechanisms causing mTBI, including striking the falx.
Main Results:
- mTBI can cause progressive axonal injury and secondary molecular changes, including mitochondrial dysfunction.
- Advanced imaging reveals structural alterations, such as gray matter deformation and white matter disruption, particularly in cingulate and cerebellar pathways.
- mTBI increases the long-term risk of neurodegenerative diseases.
Conclusions:
- mTBI represents a progressive, ultrastructural injury that conventional MRI often fails to detect.
- Sensitive imaging techniques are crucial for identifying mTBI-related brain damage and understanding its long-term consequences.
- Understanding mTBI mechanisms is key to addressing persistent behavioral and cognitive symptoms.
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