Chronic lumbar back disco...

A 78-year-old male patient was seen with left L5 sciatica and chronic lumbar back discomfort. He had previously undergone lumbar discal hernia surgery at L2-L3 in 2012 and lumbar spinal surgery for spinal stenosis at the levels of L3-L4 and L4-L5 in 2004. However, a significant difference was visible between the 2012 and 2018 MRIs. While there was a left posterolateral disc protrusion in 2012 (Figure(1A), Figure(1B)), there is now a mass (Figure(1C), Figure(1D)) that is distinct from the nerve roots and is situated behind the longitudinal posterior lumbar ligament (PLL) and behind the dura mater in the cerebrospinal fluid.