Enhancing LITT Planning Near Critical Brain Areas Using Preoperative fMRI
Overview
This case series demonstrates the utility of preoperative functional MRI (fMRI) in guiding laser interstitial thermal therapy (LITT) for intracranial lesions near eloquent brain regions. fMRI enabled precise localization of functional areas, improving patient selection, surgical planning, and intraoperative safety, thereby reducing postoperative deficits.
Background
Laser interstitial thermal therapy (LITT) is a minimally invasive technique increasingly used to treat brain tumors, radiation necrosis, and epileptogenic foci. Despite advancements such as MR guidance and real-time thermography, LITT near eloquent brain structures carries a risk of thermal injury and functional deficits. Traditional intraoperative mapping is limited by physiologic movement and procedural constraints. Preoperative fMRI offers a non-invasive method to localize language and motor areas, potentially enhancing the safety and efficacy of LITT in high-risk lesions.
Data Highlights
Patient
Lesion Location
fMRI Findings
LITT Performed
Outcome
1-6
Various eloquent areas (temporal, supramarginal, parietal)
Functional areas localized; safe margins identified
Yes
No new postoperative deficits reported
7
Paracentral lesion near motor cortex
Significant eloquent involvement; high risk
No
Underwent open resection; succumbed to disease progression
Key Findings
Preoperative fMRI successfully lateralized language and localized motor areas relative to lesions in all patients.
Functional maps were integrated into surgical navigation systems to guide LITT trajectory planning and intraoperative safety margins.
Intraoperative temperature safety points were placed based on fMRI data to prevent thermal injury to eloquent cortex.
One patient was excluded from LITT due to high risk of functional damage identified by fMRI, opting for open resection instead.
No new postoperative motor or language deficits were observed in patients who underwent fMRI-guided LITT.
Use of fMRI allowed for tailored treatment decisions balancing tumor ablation and preservation of neurological function.
Clinical Implications
Incorporating preoperative fMRI into the LITT workflow enhances the surgeon’s ability to identify and preserve critical functional brain areas, particularly near eloquent cortex. This approach improves patient selection and intraoperative safety, potentially reducing postoperative neurological deficits. fMRI-guided planning should be considered for lesions adjacent to language or motor regions to optimize outcomes.
Conclusion
Preoperative fMRI is a valuable adjunct in planning and performing LITT near critical brain areas, enabling safer ablation with preservation of neurological function. This technique supports personalized treatment strategies in complex intracranial lesions.
References
Neurosurgical Literature 2024 -- Utilizing Functional MRI to Guide LITT
