PMC5609443_01
Sagittal STIR (a) and axial T2-weighted (b) MRI of the lumbar spine showing L4-L5 isthmic spondylolisthesis with an interspinous fistulous tract through interspinous processes and a posterior paravertebral collection compatible with CSF
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F1
Meyerding L4-L5 chronic spondylolisthesis/lysis. Magnetic resonance imaging (MRI) showed an L4-L5 isthmic spondylolisthesis/lysis with an interspinous and posterior paravertebral collection consistent with a CSF fistula/pseudomeningocele [Figure 1].
Sagittal T2-weighted (a) and axial T2-weighted (b) MRI of the lumbar spine showing the spinal canal decompression with resolution of the pseudomeningocele
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F2
One year later, the MRI examination showed complete resolution of the pseudomeningocele and fusion at the L4-L5 level was confirmed (on dynamic X-rays) [Figure 2].