Clinical Scorecard: Long-term Imaging Changes Following the Surgical Removal of Dysembryoplastic Neuroepithelial Tumors: Observed Patterns and Predictive Factors
Tumor growth and satellite lesions (SLs) influencing seizure control and radiological progression post-surgery
Target Population
Pediatric and adult patients undergoing surgical resection for histologically confirmed DNET
Care Setting
Neurosurgical and neuro-oncology centers with MRI imaging and epilepsy management capabilities
Key Highlights
Gross total resection (GTR) is the goal but may be limited by tumor location, especially in eloquent cortex such as the central lobe.
Satellite lesions (SLs) adjacent but separate from the main tumor mass are associated with incomplete resection and higher recurrence risk.
The Sainte-Anne MRI classification stratifies DNETs into three types correlating with histology and epileptogenic zones but requires further validation for prognostic use.
Guideline-Based Recommendations
Diagnosis
Histological confirmation of DNET following surgical resection.
Preoperative MRI assessment to identify tumor location, presence of satellite lesions, and classification by Sainte-Anne MRI system.
Consider molecular testing for relevant alterations such as FGFR1 when available.
Management
Aim for maximal safe resection with intent for gross total resection (GTR) to optimize seizure control and reduce progression risk.
Exercise caution with tumors involving the central lobe to minimize permanent neurological deficits.
Monitor residual lesions and satellite lesions closely; consider reoperation if progression occurs.
Monitoring & Follow-up
Serial MRI follow-up to detect radiological progression defined by new or growing lesions near resection cavity.
Seizure outcome assessment using Engel classification at 12 months and last follow-up.
Document postoperative complications and differentiate transient versus permanent deficits.
Risks
Incomplete resection and presence of satellite lesions increase risk of tumor progression and seizure recurrence.
Surgical resection in eloquent cortex carries risk of permanent neurological deficits.
Reoperation may be required for progression but carries additional procedural risks.
Patient & Prescribing Data
Patients with histologically confirmed DNET undergoing surgical resection, including children and adults.
Gross total resection is associated with no observed tumor progression; incomplete resection and satellite lesions predict higher progression risk and seizure recurrence.
Clinical Best Practices
Perform early postoperative MRI within 48 hours to assess extent of resection accurately.
Use standardized MRI classification (Sainte-Anne system) to characterize tumor patterns preoperatively.
Balance aggressive resection with preservation of neurological function, especially in central lobe involvement.
Implement long-term follow-up with serial imaging and seizure monitoring to guide further management.
Consider multidisciplinary approach including neurosurgery, neuro-oncology, and epilepsy specialists.
