Fig. 1. A 83-year-old man with left L5 radiculopathy. (A) T1-weighted sagittal image shows marked disc space narrowing and low signal intensity lesion (white arrow). (B) T2-weighted axial image shows an oval-shaped low signal intensity lesion (white arrow) compressing dural sac at L4-5 level. (C) CT scan shows mutilple lucent areas in the intervertebral disc produced by the vacuum phenomenon (black arrow). (D) Axial CT scan shows an oval, aircontaining cystic lesion (white arrow outlined in black), well correlated with the MR images. HU(Hounsfield unit, white dot) is compatible with gas formation (-816).
