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Clinical correlations with hippocampal atrophy
1Mayo Medical School, Department of Neurology, Mayo Clinic, Rochester MN 55905, USA.
Abstract:
There is now a consensus that magnetic resonance imaging (MRI) is a sensitive and specific indicator of mesial temporal sclerosis (MTS) in patients with partial epilepsy. MTS is the most common pathological finding underlying the epileptogenic zone in patients undergoing temporal lobe surgery for medically refractory partial seizures. MRI-based hippocampal volumetric studies (i.e., quantitative MRI), has been shown to provide objective evidence for hippocampal atrophy in patients with MTS. The hippocampal volume in the epileptic temporal lobe has correlated with the neuronal cell densities in selected hippocampal subfields. A history of febrile seizures in childhood and age of unprovoked seizure onset have been associated with MRI-based hippocampal volumetry. There is conflicting evidence regarding the relationship between the duration of the seizure disorder and volumetry. Quantitative MRI has compared favorably to other noninvasive techniques (e.g., scalp-recorded EEG), in indicating the diagnosis of medical temporal lobe epilepsy (MTLE). MRI-identified hippocampal atrophy has also been a favorable prognostic indicator of seizure outcome after temporal lobe surgery. The presence of hippocampal atrophy appears to serve an in vivo surrogate for the presence of MTS.
Insights
Magnetic resonance imaging (MRI) accurately detects mesial temporal sclerosis (MTS), a common cause of epilepsy. Quantitative MRI measures hippocampal atrophy, aiding in epilepsy diagnosis and predicting surgical outcomes.
Area of Science:
- Neurology
- Radiology
- Epileptology
Background:
- Mesial temporal sclerosis (MTS) is the primary pathology in the epileptogenic zone for patients with medically refractory partial epilepsy undergoing temporal lobe surgery.
- Magnetic resonance imaging (MRI) is recognized as a sensitive and specific diagnostic tool for MTS.
Purpose of the Study:
- To evaluate the utility of quantitative MRI, specifically hippocampal volumetry, in assessing MTS.
- To determine the correlation between hippocampal volume, neuronal cell density, and clinical factors in epilepsy patients.
- To assess the prognostic value of MRI-identified hippocampal atrophy in surgical outcomes.
Main Methods:
- Utilized MRI-based hippocampal volumetric studies (quantitative MRI) to measure hippocampal atrophy.
- Correlated hippocampal volume with neuronal cell densities in hippocampal subfields.
- Examined associations between volumetry and clinical history, including febrile seizures and seizure onset age.
Main Results:
- Quantitative MRI provides objective evidence of hippocampal atrophy in patients with MTS.
- Hippocampal volume in the affected temporal lobe correlates with neuronal cell densities.
- MRI-identified hippocampal atrophy is a favorable prognostic indicator for seizure outcome post-surgery.
- Quantitative MRI demonstrates superiority over scalp-recorded EEG for diagnosing medical temporal lobe epilepsy (MTLE).
Conclusions:
- MRI-based hippocampal volumetry is a valuable tool for diagnosing MTS and MTLE.
- Hippocampal atrophy detected by MRI serves as an in vivo surrogate for MTS.
- Quantitative MRI findings aid in predicting the success of temporal lobe surgery for epilepsy.