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Pathophysiology of posttraumatic temporal lobe lesions.
Alexandre Varella Giannetti1, Mirto Nelso Prandini, Audrey Beatriz Santos Araujo
1Division of Neurosurgery, Hospital das Clínicas, Federal University of Minas Gerais, Belo Horizonte, Brazil. agjg@zaz.com.br
Surgical Neurology
|June 22, 2005
Summary
Temporal lobe lesions after head injury can worsen. Hemorrhage often enlarges early, while edema and necrosis develop later without significant clinical impact.
Area of Science:
- Neurology
- Neurosurgery
- Radiology
Background:
- Posttraumatic temporal lobe lesions can lead to neurological decline.
- These lesions have two main components: hemorrhage (hyperdense on CT) and edema/necrosis (hypodense on CT).
- Understanding lesion evolution is crucial for managing head injuries.
Purpose of the Study:
- To analyze the natural evolution of posttraumatic temporal lobe lesions.
- To investigate the clinical impact of lesion components (hemorrhage, edema, necrosis).
- To identify factors influencing lesion progression.
Main Methods:
- Prospective study of 40 head-injured patients with temporal lobe lesions.
- Serial computed tomography (CT) scans at 36 hours, 7 days, and 30 days post-injury.
- Comparison of factors like injury-to-CT interval, age, and alcohol consumption in patients with hemorrhage enlargement.
Main Results:
- Hemorrhage enlargement occurred in 14 patients, primarily when admitted within 3 hours.
- The hypodense component (edema/necrosis) increased within 36 hours and peaked by the first week.
- Hypodense component evolution was independent of hemorrhage behavior or surgical intervention.
Conclusions:
- The hyperdense component (hemorrhage) of temporal lobe lesions tends to enlarge in the initial hours post-injury.
- Edema and necrosis develop more gradually and typically lack significant clinical manifestations.
- Early admission within 3 hours is associated with hemorrhage enlargement.