Fig. 2

CT images. a Sagittal reconstruction of the lumbar spine illustrating close approximation and contact of spinous processes at L4-L5 level with sclerosis, flattening and enlargement of the articulating surfaces (white arrow). b Axial image in the same patient illustrating nodular enlargement of the L4 spinous process (white arrow). c Axial image in the same patient illustrating normal architecture of the L2 spinous process (white arrow). d Coronal reconstruction in the same patient illustrating nodular enlargement of the L4 spinous process (white arrow)