Fig. 4

Magnetic resonance images of the caudal lumbar vertebral column of Case 1 post surgery, including T2-weighted sagittal (a) and T1-weighted sagittal (b) images. L7 is labelled with an asterisk. The meningeal cyst is absent and post-surgical changes are seen in the soft tissues dorsal to the region of interest. N.B. The oval structure at approximately the previous position of the meningeal cyst (see Fig. 1a, b) is a fat graft (T1-weighted and T2-weighted hyperintense)