March 13, 2019

Detecting Subtle Epileptogenic Lesions in MRI-Negative Pediatric Epilepsy

Children with drug-resistant focal epilepsy and focal cortical dysplasia who undergo complete resection of Morphometric Analysis Program (MAP)-positive regions are more likely to experience seizure-free outcomes compared with children who receive no or partial resection, according to a study published in the European Journal of Neurology.

Using a 2002 to 2015 surgical database, researchers included a consecutive cohort of pediatric patients with drug-resistant focal epilepsy and focal cortical dysplasia who underwent epilepsy surgery before 21 years of age, had a preoperative 1.5T or 3T MRI, had a negative presurgical MRI, and had 12 or more months of postsurgical follow-up data (n=78).

MAP on T1-weighted volumetric MRI was used to perform MRI postprocessing, and the researchers compared these data with an age-specific normal pediatric population (n=370). Surgical outcome and pathology data were also used to confirm the pertinence of MAP-positive areas.

Approximately 56% of patients (n=44) demonstrated positive MAP regions. In the 3- to 5-year, 5- to 10-year, 10- to 15-year, and 15- to 21-year-old age groups, the MAP-positive rates were 100% (2 of 2), 77% (13 of 17), 63% (15 of 24), and 40% (14 of 35), respectively. Approximately 45% of patients with temporal resection and 63% of patients with extratemporal resection had MAP-positive rates. Compared with patients with no or partial resection of the MAP-positive regions, patients who received complete resection of MAP-positive regions were more likely to experience a seizure-free outcome (P <.001).

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