PMC6322170_01
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
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F1
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].
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
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F2
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].
The surgical specimen shows the calcified mass that is almost removed en-block
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F3
The patient underwent a C4-C6 laminectomy for resection of large dorsolateral OLF masses (C45, C56) [Figure 3].
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
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F4
The histological examination confirmed OLF [Figure 4].
Post-op sagittal cervical MRI, (a) and (b) laminectomy and decompression of the cord is shown both in T1- and T2-weighted images
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F5
The MRI taken 2 weeks later confirmed adequate canal decompression [Figure 5].