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. 2018 Mar 19;128(4):1657–1670. doi: 10.1172/JCI94331

Figure 5. Intrathecal administration of a gadolinium-based contrast agent.

Figure 5

An MRI scan was performed as part of a diagnostic evaluation using a dilute amount of gadolinium-based contrast agent injected intrathecally to trace the distribution of CSF in the lumbar region of a single patient. (A) A coronal maximum-intensity projection of T1-weighted fat-saturated MRI shows a high signal in the thecal sac, which extends along nerve root sheaths (arrowheads), without signal within the lumbar ganglia. (B) Axial sections through the lumbar nerve root sheaths (arrowheads) show contrast filling in the nerve root sheaths approaching the DRGs. (C) Axial sections through the DRG (arrows) show no contrast agent in or around the DRGs. Scale bars: 1 cm.