Cortical remodeling before and after successful temporal lobe epilepsy surgery

Area of Science:

• Neuroscience
• Radiology
• Epilepsy Research

Background:

• Mesial temporal lobe epilepsy (mTLE) is a common cause of drug-resistant epilepsy.
• Anterior temporal lobectomy (ATL) is a surgical option for intractable mTLE.
• Understanding dynamic brain changes post-surgery is crucial for evaluating treatment outcomes.

Purpose of the Study:

• To investigate dynamic changes in cortical thickness in mTLE patients before and after ATL.
• To compare cortical thickness patterns between mTLE patients and healthy controls.
• To identify brain regions undergoing thinning or thickening following successful epilepsy surgery.

Main Methods:

• High-resolution T1-weighted MRI scans were acquired from 28 mTLE patients (seizure-free post-ATL) and 29 healthy controls.
• Patient scans were collected at five time points: pre-surgery, and 3, 6, 12, and 24 months post-surgery.
• Linear mixed models were used to analyze dynamic cortical thickness alterations.

Main Results:

• Pre-surgery, mTLE patients showed thinning in regions including the entorhinal cortex, parahippocampal gyrus, and bilateral cMFG.
• Post-surgery, patients exhibited thinning in the ipsilateral temporal lobe, insula, and other areas.
• Cortical thickening was observed in contralateral regions like the rACC, with dynamic changes over time.

Conclusions:

• mTLE patients demonstrate widespread cortical thinning both before and after ATL.
• Progressive thinning predominantly occurs in areas adjacent to the surgical resection.
• Postoperative cortical thickening may signify adaptive brain remodeling after successful ATL.