<unk> s are extradural lesions that arise from the<unk>  lining of the facet joints. Most cysts are found at the L4-L5 facet joint, as this is the level where the most biomechanical spinal motion occurs.<unk>  cysts may extend into the neural foramen or spinal canal and result in symptomatic radiculopathy, spinal stenosis, or both. Patients may also experience neurologic claudication if the cyst is large enough to cause substantial spinal cord compression. The differential diagnosis for<unk>  cysts includes arachnoid cysts, Tarlov cysts, schwannomas, and migrated herniated disk fragments.
Intraspinal synovial cyst
Spinal disc herniation
Intraosseous lipoma
Epidural abscess
Vertebral osteomyelitis
Spondylolisthesis
Unicameral bone cyst
Spinal tumor