Most often, in cases of recurrent radiculopathy after discal surgery, CT and especially MR images are used for differentiating recurrent disc lesions from fibrous scars (47). However, in about 10% of the cases, MR may be equivocal, and CT discography is then indicated because it has been shown that sensitivity and specificity of CT discography are superior to MR (47-49). Clarisse proposed a double-contrast technique to perform disco-CT to differentiate a true recurrent protrusion from a residual cavity-containing liquid. The gas will fill the cavity in the latter case, and not in the former (50).
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