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Figure 1: Sagittal magnetic resonance imaging study on T1-weighted (a) and T2-weighted (b) images show an apparent fluid-fluid level (arrow) in the lumbosacral thecal sac. The signal intensities reveal the sedimentary blood products in the most dependent portion of the thecal sac

Figure 1: Sagittal magnetic resonance imaging study on T1-weighted (a) and T2-weighted (b) images show an apparent fluid-fluid level (arrow) in the lumbosacral thecal sac. The signal intensities reveal the sedimentary blood products in the most dependent portion of the thecal sac