title: [Lumbar reprolapse or scar tissue? An attempt at differentiation via a computer tomographic bicolor mode].
abstract: The bicolour mode for computer tomography is explained. It replaces the soft tissue level of the computer tomogram by setting the window level to +55 Hu and its width to 1 Hu. Structures in the spinal canal with attenuation values greater than 56 Hu appear white. The cauda equina has an attenuation value of less than +45 Hu. Disc prolapses, scar tissue and solid tumours (with the exception of lipomas) have attenuation values greater than +55 Hu. The use of the bicolour mode combined with intravenous contrast in patients with post-operative symptoms can often help to differentiate between reprolapse and scarring. A time-saving method for the bicolour mode is described.
mesh_terms: D002921:Cicatrix / Q000000981:diagnostic imaging*; D003116:Color; D003937:Diagnosis, Differential; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000000981:diagnostic imaging* / Q000601:surgery; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging* / Q000601:surgery; D011183:Postoperative Complications / Q000000981:diagnostic imaging*; D011391:Prolapse; D012008:Recurrence; D014057:Tomography, X-Ray Computed / Q000379:methods*
vernacular_title: Lumbaler Reprolaps oder Narbengewebe? Versuch der Differenzierung mittels computertomographischem Bicolor-Modus.