Introduction: Os odontoideum (OO) is a form of odontoid anomaly presented by a separate ossicle with a smooth, sclerotic border not fused with C2 body. The current paper reports a boy with irreducible displaced os odontoideum with severe neurologic deficit after a minor trauma. Case Presentation: A 16-year-old boy admitted in the center due to neck pain and torticollis with neurologic deficit. He had a history of multiple minor traumas. Advanced imaging assessment demonstrated displaced os odontoideum with minimal space available for cord (SAC) and myelomalacia. After unsuccessful closed reduction a 2-stage operation was planned: first, the anterior transoral release and odontoid resection with subsequent halo-traction and second, the posterior atlanto-axial instrumented fusion with bilateral C1 hook and C2 pedicular screws. Conclusions: Congenital anomalies of the odontoid are associated with C1-C2 instability that can be subluxated or dislocated with minor trauma and cause permanent neurologic deficit or even death. When acute cervical spine trauma is imaged, os odontoideum should be distinguished from an acute dens fracture with a multimodality imaging approach including computed tomography (CT), magnetic resonance imaging (MRI) and radiography. Here is the report of a rare case with irreducible displaced os odontiodeum treated him with anterior release, odontoid resection and posterior C1-C2 instrumented fusion.

A 45-year-old man presented to our facility with predominantly Sciatica-like leg pain and lower extremity motor weakness, who did not get relief despite undergoing two consecutive lumbar surgeries for suspected lumbar disc herniation. Medical history, physical findings, and a magnetic resonance imaging scan revealed thoracic cord tumor as the underlying disease. Our patient had complete resolution of his back and leg pain following surgical resection of the thoracic Schwannoma. Thoracic cord compression often results in diffuse pain and myelopathic symptoms caused by the irritation of ascending spinothalamic tract, which causes a vague and burning pain that should be differentiated from nerve root lesions and can be the first presentation of a thoracic cord lesion.

Introduction: Anterior Lumbar Meningoceles (MCs) are rare in the patient with Neurofibromatosis type 1 (NF1). Although spinal fusion with optimal resection of the meningocele might be indicated in these special cases, no report could completely describe a huge meningocele after posterior spinal instrumented fusion. Case Presentation: Here we present a 23 years old woman with a history of NF-1 and ‬previous posterior spinal fusion, who was referred to the neurosurgery department because of abdominal pain and retroperitoneal mass secondary to large anterior lumbar MC. The MC was filling the retroperitoneal cavity and protruded to the anterior wall of abdomen. ‬‬‬‬‬As an elective procedure, reduction and closure of cyst was achieved through posterior approach. Postoperatively, the patient reported satisfactory relief of abdominal pain. Conclusion: Lumbar anterior MC is rare in the patients with NF1. When surgical intervention is indicated, ‬reduction of cele should be considered.

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