- Impaired Default Mode Network on Resting-State fMRI in Children with Medically Refractory Epilepsy
This article explores the possibility that the default mode network as seen on resting state fMRI is abnormal in children with medically refractory epilepsy as it is in adults. Studies in 11 patients showed abnormal default mode networks with decreased connectivity but no correlations with age of seizure onset, duration of epilepsy, number of medications, seizure frequency, or IQ.
- Comparison of MR Imaging Findings between Extraligamentous and Subligamentous Disk Herniations in the Lumbar Spine
Extra- and subligamentous lumbar disk herniations are treated differently. These authors utilized 10 criteria in an attempt to establish the exact location of disk herniations with respect to the posterior longitudinal ligament. Extraligamentous herniations showed: 1) spinal canal compromise of more than half its diameter, 2) internal signal difference in the disk, 3) ill-defined disk margins, 4) disruption of the continuous low-signal-intensity line covering the disk, and 5) presence of an internal dark line in the herniated disk. When combined these 5 yield sensitivity, specificity, accuracy, and an odds ratio of 77.3%, 74.5%, 76.1%, and 9.93, respectively.
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