case_images: PMC9946913_01
case_images: (A) Sagittal, (B) axial T2 magnetic resonance imaging, and (C) sagittal computed tomography scan of the cervical spine show an os odontoideum associated with anterior displacement of the occipitocervical junction resulting in compression of the spinal cord at the level of the odontoid process tip marked by arrows.
case_images: jyms-2022-00234f1.jpg
case_images: PMC9946913_01_jyms-2022-00234f1.jpg
case_images: f1-jyms-2022-00234
case_images: Computed tomography (CT) and magnetic resonance imaging (MRI) of the cervical spine revealed an os odontoideum associated with anterior displacement of the occipitocervical junction, resulting in compression of the spinal cord at the level of the tip of the odontoid process (Fig. 1).
case_images: (A) Sagittal computed tomography scan of the cervical spine performed after the second surgery showed the extent of decompression marked by an arrow; and reduction in displacement with (B) left and (C) right parasagittal views showed occipitocervical fusion of C0-C1-C2 by the posterior approach.
case_images: jyms-2022-00234f2.jpg
case_images: PMC9946913_01_jyms-2022-00234f2.jpg
case_images: f2-jyms-2022-00234
case_images: A CT scan of the cervical spine performed after the second surgery showed the extent of decompression and reduction in displacement with occipitocervical fusion of C0-C1-C2 by the posterior approach (Fig. 2).
case_images: PMC9946913_02
case_images: (A) Sagittal computed tomography (CT) scan and (B) magnetic resonance imaging of the craniocervical junction show the residual syringomyelic cavity from C4 to T1 with compression of the brainstem by the basilar impression marked by white stars. Postoperative (C) sagittal and (D) axial CT scans show the extent of resection of the C1 anterior arch and odontoid tip marked by an arrow.
case_images: jyms-2022-00234f3.jpg
case_images: PMC9946913_02_jyms-2022-00234f3.jpg
case_images: f3-jyms-2022-00234
case_images: CT and MRI of the craniocervical junction were performed in February 2020, confirming stability of the residual syringomyelic cavity from C4 to T1, compression of the brainstem by the BI, and pseudomeningocele at the operative site (Fig. 3A, 3B).