Traumatic Rupture of a Skull Base Dermoid Cyst Mimicking Chronic Meningitis.

Cranial dermoid cysts are rare, embryologic tumors containing fat, hair, and other ectodermal elements. They occur most frequently in the posterior fossa and are typically diagnosed as incidental findings on brain imaging done for an unrelated reason. Traumatic rupture of a previously unidentified intracranial dermoid cyst can mimic symptoms of post-concussion syndrome and should be ruled out with magnetic resonance imaging (MRI).

Extended B-cell depletion beyond 6-months in patients receiving ocrelizumab or rituximab for CNS demyelinating disease.

Objectives: To investigate the duration of B-cell depletion in a cohort of patients receiving ocrelizumab or rituximab for multiple sclerosis (MS) or neuromyelitis optica spectrum disorders (NMOSD).

Methods: We retrospectively searched our database for patients diagnosed with MS or NMOSD, who were receiving ocrelizumab or rituximab and had available CD19 measurements. We collected demographic data, infusion doses, infusion dates, CD19 absolute counts and percentages, and their collection dates.

Association of cell phone location data and trends in COVID-19 infections during loosening of stay-at-home restrictions.

We report that during the loosening of stay-at-home mandates, U.S. counties with more county level workplace cell phone activity had a more rapid increase in incidence of COVID-19.

Multi-parametric quantitative MRI of normal appearing white matter in multiple sclerosis, and the effect of disease activity on T2.

White matter (WM) lesions with a distinct lesion-tissue contrast are the main radiological hallmark of multiple sclerosis (MS) in standard magnetic resonance imaging (MRI). Pathological WM changes beyond lesion development lack suitable contrasts, rendering the investigation of normal appearing WM (NAWM) more challenging. In this study, repeat quantitative MRI (qMRI) was collected in 9 relapsing remitting MS patients with mild disease over nine months.

The Faces of Predictive Coding.

Recent neurophysiological accounts of predictive coding hypothesized that a mismatch of prediction and sensory evidence-a prediction error (PE)-should be signaled by increased gamma-band activity (GBA) in the cortical area where prediction and evidence are compared. This hypothesis contrasts with alternative accounts where violated predictions should lead to reduced neural responses. We tested these hypotheses by violating predictions about face orientation and illumination direction in a Mooney face-detection task, while recording magnetoencephalographic responses in a large sample of 48 human subjects.