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There is T2 mildly hyperintense, T1 hypointense mildly enhancing lesion within the central inner aspect of the left C7 lamina. This has a maximum transverse diameter of 9.3 mm. This is contiguous with an extraosseous cystic component in the left posterolateral aspect of the spinal canal measuring 6 mm AP x 5.7 mm transverse. The latter exhibits T2 central hyperintensity with a rim of hypointensity and demonstrates rim of enhancement. On the correlative CT images, the extraosseous intraspinal canal component shows a rim of incomplete calcification. The adjacent left C7/T1 facet joint shows degenerative changes with severe loss of disc space height and subchondral sclerosis. Consequently there is moderate compression of the left hemicord at C7 level.
There is partly osseous partly extraosseous cystic lesion related to left C7 lamina with moderate compression of the left hemicord at C7. The imaging appearances are most probably of a degenerative intraspinal cyst (subchondral cyst versus a ganglion).