Letter to editor concerning: “Intradural lumbar disc herniation: report of five cases with literature review”

Dear Sir, We have a point we would like to make in reference to the article entitled “Intradural lumbar disc herniation: report of five cases with literature review”, published by Ducati et al. [1] in European Spine Journal. Our attention was drawn to the fact that this author made no reference to a number of studies previously published by us [2, 3] and other authors [4, 5] which mention the association of intradural herniations or cysts with gas within the spinal canal. Moreover, we had already advised in our previous study of the possible need for intradural exploration where the CT or MRI imaging studies show the existence of gas within the canal and the intraoperative findings do not explain the patient’s symptoms.