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case_images: Preoperative plain radiograph of the cervical spine. An osseous protrusion in the right C6/7 foramen could be observed
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case_images: C6/7 foramen (Fig. 1). Computed tomography (CT) scans showed an osseous tumor originating in the neighborhood of the right C6/7 facet joint and occupying a part of the spinal canal (Fig. 2).
case_images: Preoperative CT and MRI of the cervical spine. Sagittal and axial CT scans demonstrated an osseous tumor originating in the neighborhood of the right C6/7 facet joint. Sagittal and axial MRI revealed an extradural mass which compressed the spinal cord severely at C6/7 level
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case_images: C6/7 foramen (Fig. 1). Computed tomography (CT) scans showed an osseous tumor originating in the neighborhood of the right C6/7 facet joint and occupying a part of the spinal canal (Fig. 2).
case_images: Operative specimen was covered with cartilaginous tissue. The tumor originated from the neighborhood of the right C6/7 facet joint and occupied part of the spinal canal
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case_images: The resected tumor was about 2 cm in diameter, and its surface was covered with cartilaginous tissue (Fig. 3).
case_images: Tumor pathology. Microphotograph of the specimen showed mature trabecular bone and fatty marrow capped by cartilaginous tissue (x100, hematoxylin and eosin)
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case_images: The pathologic examination indicated mature trabecular bone with a cartilaginous cap, and we had a diagnosis of a benign osteochondroma (Fig. 4).
case_images: Postoperative plain radiograph and CT of the cervical spine. Post-operative radiograph of the cervical spine did not show each segmental instability. Moreover, post-operative CT scan showed complete resection of the tumor, and demonstrated that over 2/3 part of the facet was preserved
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case_images: Also, post-operative CT scan showed the removal of the lesion, and demonstrated that over 2/3 part of the facet was preserved (Fig. 5).