The imaging shows calcification of the dura, with no intrathecal calcified structures, excluding arachnoiditis ossificans, and without involvement of the ligamentum flavum. One of the recognized underlying causes is chronic renal failure, either alone or with associated hyperparathyroidism. The patient presented with symptomatic lumbar canal stenosis, a laminectomy was performed, and the dural calcification was an incidental finding on post-operative imaging.  There was only mild renal impairment and no other cause identified.