Lateral myelogram of the thoracolumbal junction. The L1-2 intervertebral disc is calcified and there is a thinning of the subarachnoid space from L1 to L4. The ventrodorsal myelogram (not included) showed an extradural mass to the right in the spinal canal compressing the spinal cord towards the left from L1 to L3, but most prominent at L1-2.