Fig. 1From: Advanced magnetic resonance imaging (MRI) techniques of the spine and spinal cord in children and adultsSagittal (a) and axial (b) T2WI shows hyperintensity of the cord (arrow), which is deformed (scalpel sign), suggesting an arachnoid web. Sagittal 3D T2WI (b) better demonstrates the web (arrow). Sagittal flow sequences (d,e) show decreased CSF flow posteriorly to the cord due to the arachnoid webBack to article page