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MRI axial image showing reduction in the size of the spinal canal (blue arrow), a pathogenetic finding in spinal stenosis; the red arrow shows radicular compression that can cause radicular pain. | Allegri, M., Montella, S., Salici, F., Valente, A., Marchesini, M., Compagnone, C., … Fanelli, G. (2016). Mechanisms of low back pain: a guide for diagnosis and therapy. F1000Research, 5, F1000 Faculty Rev-1530. https://doi.org/10.12688/f1000research.8105.2