case_images: PMC6322170_01
case_images: Cervical MRI: (a) T1-weighted sagittal image showing a heterointense epidural mass at the posterior aspect of the spinal cord at the C4-C5 level, a smaller one is visualized below this level. (b) T2-weighted sagittal image demonstrating a hypointense mass with an isointensity at the center of the mass. (c) It also reveals a significant reduction in the cervical canal diameter
case_images: SNI-9-263-g001.jpg
case_images: PMC6322170_01_SNI-9-263-g001.jpg
case_images: F1
case_images: OLF [Figure 1]. On the T2-weighted MRI, the mass was isointense with a hypointense peripheral rim [Figure 1]. The CT scan confirmed ossification of both OYL lesions [Figure 2].
case_images: Cervical computed tomography (CT) scan. (a) Sagittal reconstructed CT showing a calcified mass between the spinal processes of C4 and C5 with canal compromise present at the site of the ligamentum flavum. (b) Axial CT demonstrated an oval-shaped calcified mass
case_images: SNI-9-263-g002.jpg
case_images: PMC6322170_01_SNI-9-263-g002.jpg
case_images: F2
case_images: T2-weighted MRI, the mass was isointense with a hypointense peripheral rim [Figure 1]. The CT scan confirmed ossification of both OYL lesions [Figure 2].
case_images: The surgical specimen shows the calcified mass that is almost removed en-block
case_images: SNI-9-263-g003.jpg
case_images: PMC6322170_01_SNI-9-263-g003.jpg
case_images: F3
case_images: The patient underwent a C4-C6 laminectomy for resection of large dorsolateral OLF masses (C45, C56) [Figure 3].
case_images: Histological examination of the surgical specimen (a) and (b) shows areas of endochondral ossification or new bone formation. At the edge, elastic bundles compatible with ligaments are noted
case_images: SNI-9-263-g004.jpg
case_images: PMC6322170_01_SNI-9-263-g004.jpg
case_images: F4
case_images: The histological examination confirmed OLF [Figure 4].
case_images: Post-op sagittal cervical MRI, (a) and (b) laminectomy and decompression of the cord is shown both in T1- and T2-weighted images
case_images: SNI-9-263-g005.jpg
case_images: PMC6322170_01_SNI-9-263-g005.jpg
case_images: F5
case_images: The MRI taken 2 weeks later confirmed adequate canal decompression [Figure 5].