Cauda Equina Syndrome after Sequestered Disc Herniation Migrating to the Dorsal Epidural Space: Case Report and Review of the Literature
Background: Posteriorly migrated epidural disc fragments (PMEDF) presenting with cauda equina syndrome are relatively common. These cases are sometimes inaccurately identified on MRI as; epidural tumors, abscesses, hematomas and or facet cysts. Proper description and identification are key to be able to provide effective and safe management. Currently we are presenting the case of a patient with cauda equina syndrome secondary to a posterior mass compression intraoperatively identified as a PMEDF. Case Description: 45-years-old male presenting with insidious low back pain that progressed to urinary retention and bilateral foot drop. An MRI of the lumbar spine showed a posteriorly located epidural lesion. That appeared to be dependent on a left facet cyst. The patient was treated with a decompressive laminectomy and multiple disc fragments were identified under the ligamentum flavum and over the posterior epidural space. Conclusion: Posterior epidural migration of a lumbar disc fragments (PEMLDF) are not a common presentation of intervertebral disc herniations and their differential diagnosis and treatment might require a different surgical approach; fusion vs decompression. PEMLDFs should be suspected on those patients presenting with sudden cauda equina syndrome and posteriorly located epidural lesions on MRI.