Longitudinally extensive transve

This is spinal cord from a patient with transverse myelitis. Transverse myelitis often extends rostrally and caudally across several spinal segments, as in this case. The unnecessarily large green arrow points to a small, darker patch of tissue which has been primarily spared from demyelination. The pale-looking areas of this cord, such as that indicated by the unnecessarily large red arrow (i.e., most of the cord in this image), is involved in the demyelinating process.