Patient 1: 29-year-old woman with primary angiitis of the CNS whose progressive paraparesis started 1 month after the onset of cerebral symptoms.
A–F, First MR study. Sagittal FSE T2-weighted (4700/112) images (A–C) show diffuse increased signal intensity within the cervical cord (arrows, A). Skip areas of slightly increased signal intensity are detectable within the upper and lower thoracic cord (arrows, B and C). Sagittal contrast-enhanced SE T1-weighted (500/12) images (D and E) show multiple small homogeneously enhancing areas of the cervical and thoracic spinal cord (arrows), primarily posterior in location, and pial enhancement of the conus. Axial contrast-enhanced SE T1-weighted (500/15) image (F) shows two posteriorly located punctate areas of homogeneous enhancement (arrows).