Fig. 1

Lateral radiographs (a) showing a small gas-forming lesion around the lumbar paravertebral area (black arrow). T2-weighted sagittal magnetic resonance imaging (b) showing multifocal fluid pockets containing air bubbles in the paraspinal area (black arrows), whole lumbar area, and epidural space (white dotted arrow). Computed tomography (c and d) scan revealing subcutaneous emphysema in the right paravertebral muscles including the multifidus and quadratus lumborum, mainly in the right side (white arrows), as well as the lumbar spinal canal at L2-S1