case_images: PMC5858046_01
case_images: This axial T2-weighted MR at the L3-L4 level demonstrated a large central hyperintense mass (bilateral synovial cysts/capsules) and ossification of the yellow ligament (OYL) filling the dorsal spinal canal at the L3-L4 level. Fluid was also noted in bilateral L3-L4 facet joints
case_images: SNI-9-56-g001.jpg
case_images: PMC5858046_01_SNI-9-56-g001.jpg
case_images: F1
case_images: The CT and the new MR scans confirmed moderate L2-L3 and severe L3-L4 stenosis/OYL with massive bilateral L3-L4 synovial cysts filling the spinal canal and the previously noted grade I l3-L4 spondylolistheiss [Figures 1-4].
case_images: The midline sagittal T2-weighted MR demonstrated a hyperintense/somewhat heterogeneous mass consistent with coalescence of bilateral synovial cysts filling the dorsal spinal canal at the L3-L4 level. Note that at surgery, the coalesced synovial cysts extended all the way to the L2-L3 level
case_images: SNI-9-56-g002.jpg
case_images: PMC5858046_01_SNI-9-56-g002.jpg
case_images: F2
case_images: The CT and the new MR scans confirmed moderate L2-L3 and severe L3-L4 stenosis/OYL with massive bilateral L3-L4 synovial cysts filling the spinal canal and the previously noted grade I l3-L4 spondylolistheiss [Figures 1-4].
case_images: The axial soft tissue CT showed marked stenosis attributed to bilateral OYL and massive calcified capsules of the bilateral synovial cysts at the L3-L4 level. Note the air within the right L3-L4 facet joint
case_images: SNI-9-56-g003.jpg
case_images: PMC5858046_01_SNI-9-56-g003.jpg
case_images: F3
case_images: The CT and the new MR scans confirmed moderate L2-L3 and severe L3-L4 stenosis/OYL with massive bilateral L3-L4 synovial cysts filling the spinal canal and the previously noted grade I l3-L4 spondylolistheiss [Figures 1-4].
case_images: This slightly parasagittal soft tissue CT demonstrated hyperdensity dorsolaterally consistent with OYL and ossification/calcification of the synovial cyst capsules at the L3-L4. Note L3-L4 degenerative spondylolisthesis was not apparent on this study
case_images: SNI-9-56-g004.jpg
case_images: PMC5858046_01_SNI-9-56-g004.jpg
case_images: F4
case_images: The CT and the new MR scans confirmed moderate L2-L3 and severe L3-L4 stenosis/OYL with massive bilateral L3-L4 synovial cysts filling the spinal canal and the previously noted grade I l3-L4 spondylolistheiss [Figures 1-4].