CT myelogram
Intradural extramedullary arachnoid cyst in a 56-year-old woman with prior lumbar spine fusion who presented with chronic lower extremity sensory changes and back pain. (a, b) Sagittal (a) and axial (...
MRI myelogram
A 50-year-old female. Sagittal fat-suppressed T2W imaging (a) displays subtle arched hyperintensities in the interspinous epidural space at the lumbar level (arrows), termed the “Dinosaur tail sign”...