Guive Sharifi - Associate Professor, Shahid Beheshti University of Medical Sciences, Loghman Hakim Hospital, Tehran, Iran
Ehsan Alimohammadi - Resident of Neurosurgery, Shahid Beheshti University of Medical Sciences, Loghman Hakim Hospital, Tehran, Iran
Kaveh Ebrahimzadeh - Assistant Professor of Neurosurgery, Shahid Beheshti University of Medical Sciences, Loghman Hakim Hospital, Tehran, Iran
Karim Moradian - Resident of Neurosurgery, Shahid Beheshti University of Medical Sciences, Loghman Hakim Hospital, Tehran, Iran

Background and Importance: Disk sequestration can be defined as a herniated disk with perforation of the fibrous ring (or outermost annulus fibrosus) and posterior longitudinal ligament with migration of the disk fragment to the epidural space. Even after the introduction of high-resolution magnetic resonance imaging (MRI), it is still frequently misinterpreted as neoplastic masses. Unfortunately, no particular symptoms or signs are also known to allow differentiation between atypical hernias and spinal tumors. Case Presentation: This study describes a rare case of a huge herniated and sequestrated disc, which is misinterpreted as a spinal tumor on the radiological report.Conclusion: MRI findings are useful in the preoperative diagnosis of disc herniation. The differential diagnosis includes not only metastatic lesions but also some other benign epidural lesions such as synovial cysts, hematomas, and abscesses.

Disk Sequestration; Spinal Tumor; Herniated Disk