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Updated: Jun 22, 2026

Intraoperative Ultrasound in Spinal Surgery
Published on: August 17, 2022
Huge intradural ossification caused by a mature spinal teratoma: case report
Kosei Ijiri1, Kazutoshi Hida, Shunsuke Yano
1Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan. kosei2@m.kufm. kagoshima- u.ac.jp
Objective:
Huge intradural ossifications in the spine are quite rare. We report for the first time a patient with a huge intradural ossification caused by a mature teratoma at the conus medullaris.
Clinical Presentation:
A 68-year-old woman presented with low back pain and gait disturbance. Computed tomographic and magnetic resonance imaging revealed a huge ossification at the tip of the conus medullaris.
Intervention:
We performed L1 and L2 laminectomy and removed the mass completely. The pathological diagnosis was mature teratoma with remarkable ossification.
Conclusion:
This unusual case of intradural ossification demonstrated regressive changes in a mature teratoma. Despite its tight adhesion to the conus medullaris and cauda equina, the ossified tumor was atraumatically removed with an ultrasonic aspirator.
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