PMC8769383_01
Imaging studies of case 1. Shuntography shows pooled contrast medium without diffusion in the spinal canal (A). Subsequent CT shows pooled medium (arrowheads) and a misplaced lumbar catheter (arrow) in the SSES (B and C). The lumbar catheter appeared to be inserted into the SSES via the ventral side of the thecal sac because of deep puncture (D). CT: computed tomography, SSES: spinal subdural epiarachnoid space.
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F1
In the spinal canal, however, it pooled without diffusion (Fig. 1A). Subsequent CT revealed both pooling of the contrast medium and presence of the tip of the lumbar catheter in the SSES (Fig. 1B and 1C). Thus, the catheter seemed to be inserted via the ventral side of the thecal sac into the SSES (Fig. 1D).
PMC8769383_02
Imaging studies of case 2. Shuntography shows pooled contrast medium without diffusion in the spinal canal (A). Subsequent tomography shows pooled medium (arrowheads) and a misplaced lumbar catheter (arrow) in the SSES (B and C). The lumbar catheter appeared to be inserted into the SSES via the lateral part of the thecal sac because of lateralized puncture (D). SSES: spinal subdural epiarachnoid space.
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F2
The medium flowed through both the lumbar and the peritoneal catheter without obvious obstruction, and it spread partially in the spinal canal (Fig. 2A). Subsequent CT revealed both pooling of contrast medium and presence of the tip of the lumbar catheter in the SSES (Figs. 2B and 2C). Thus, the catheter appeared to be inserted into the SSES via the lateral part of the thecal sac (Fig. 2D).