FIGURE 2.

Magnetic resonance images of cystic lesions at the level of the atlanto‐axial joint. Sagittal (A) and transverse (B) T2‐weighted, transverse FLAIR (C), T1‐weighted (D), and T1‐weighted post‐contrast (E) magnetic resonance images. The lesion appears hyperintense in T2‐weighted images (A, B). In the T2‐weighted FLAIR image, hyperintensity is observed compared with CSF (C), and there is mild peripheral enhancement (white arrowhead) in T1‐weighted post‐contrast images (E). At the atlanto‐axial joint level, the lesion in the dorsal region of the vertebra is observed as multiloculated cystic structures, with the right side of the lesion observed to be larger (white arrow). Deviation of the muscles around the cysts and compression of the muscles due to the cysts were observed. Ax, axis; FLAIR, fluid‐attenuated inversion recovery; L, left; R, right.