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A 53-year-old woman has low back pain and right-sided radicular leg pain. Axial and sagittal T2-weighted MRI show a well-circumscribed fluid-signal extradural lesion adjacent to the right L4–L5 facet joint, causing posterolateral compression of the thecal sac. What is the most likely diagnosis?

singleBestAnswer

Axial and sagittal T2-weighted lumbar MRI showing a well-circumscribed fluid-signal extradural lesion adjacent to the right L4–L5 facet joint with posterolateral thecal sac compression.

Axial and sagittal T2-weighted MRI of the lumbar spine. Arrows indicate the extradural lesion adjacent to the right L4–L5 facet joint.

1

Lumbar synovial cyst

2

Tarlov cyst

3

Pseudomeningocele

4

Sequestered lumbar disc fragment

5

Ligamentum flavum cyst

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abnormality of spinal alignment.png

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