Gliosis is a reactive response of glial cells (astrocytes, microglia) to central nervous system injury. In the right frontal lobe, it manifests as scarring and structural alteration of white matter.
Mechanism
- Injury (trauma, stroke, infection, neurodegeneration) → glial activation.
- Astrocytes proliferate, hypertrophy, and form a glial scar to isolate damage.
- Microglia release inflammatory cytokines, contributing to neuroinflammation.
Functional Consequences
The right frontal lobe governs executive functions: decision-making, problem-solving, attention, social cognition, and emotional regulation. Gliosis here can cause:
- Executive dysfunction
- Personality changes
- Impaired judgment and planning
- Attention deficits
- Social inappropriateness
Clinical Context
- Seen on MRI as T2/FLAIR hyperintensity in right frontal white matter.
- May be incidental (aging, remote minor injury) or signify active pathology (MS, tumor, chronic ischemia).
- Correlation with clinical history and serial imaging is essential.
Consult a neurologist for evaluation if gliosis is identified on imaging.
