PMC8247752_01
Pre- and intraoperative findings of T11/T12 ossification of the yellow ligament (OYL). (a-c) The lesion was hypointense on T2-weighted images (a and b) while the CT showed it was ossified (c). (d) The vertebral arches of T11/T12 were exposed. (e) Bilateral laminectomy of T11/T12 was performed, and a thick OYL was found. (f) The OYL was drilled thin and resected piece by piece, and the dura mater was confirmed.
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F1
OYL resulting in cord compression (i.e. the lesion was hypointense on T2-weighted images while the CT showed it was ossified), the patient successfully underwent a bilateral laminectomy of T11/T12 with progressive resolution of the myelopathy over 6 postoperative months [Figure 1af]. Of interest, the brain CT and brain/cervical MR studies additionally demonstrated a posterior fossa arachnoid cyst (i.e. unchanged over a 17 year period), with an acquired Chiari I malformation (cerebellar tonsil descent 5 mm) with C7-T5 syrinx [Figure 2a and b].
The brain CT and brain/cervical MR studies demonstrated a posterior fossa arachnoid cyst (a), with an acquired Chiari I malformation with C7-T5 syrinx (b).
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F2
OYL resulting in cord compression (i.e. the lesion was hypointense on T2-weighted images while the CT showed it was ossified), the patient successfully underwent a bilateral laminectomy of T11/T12 with progressive resolution of the myelopathy over 6 postoperative months [Figure 1af]. Of interest, the brain CT and brain/cervical MR studies additionally demonstrated a posterior fossa arachnoid cyst (i.e. unchanged over a 17 year period), with an acquired Chiari I malformation (cerebellar tonsil descent 5 mm) with C7-T5 syrinx [Figure 2a and b].