Nerve roots herniating into a pseudomeningocele. A 78-year-old male underwent laminectomy and discectomy for L4--L5 disk herniation. A giant pseudomeningocele (length, 9 cm; width, 5 cm; depth, 3 cm) developed after surgery. Nerve roots herniating through the dural and arachnoid tears and into the pseudocyst was observed on axial MRI (arrow).
Weng et al. BMC Musculoskeletal Disorders 2010 11:53 doi:10.1186/1471-2474-11-53