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Fig 4. A–D, MR images of an 83-year-old man who was diagnosed with osteonecrosis at the L1 vertebral body. There coexists both intravertebral fluid and air in the affected vertebral body. A, Sagittal T2-weighted turbo spin-echo image (4,000/110) shows hyperintensity at middle third (arrowhead) and signal intensity void at anterior third (arrow) of the vertebral body. B, Sagittal contrast-enhanced T1-weighted, fat-suppressed turbo spin-echo image (550/12, 4-mm section thickness) shows nonenhancement of the anterior two thirds of the vertebral body (arrow and arrowhead). Only the posterior one third of vertebra had enhancement. C, Transverse T2-weighted turbo spin-echo image (4000/110) shows an ellipsoidal signal intensity void area (arrow) anterior to the hyperintensity within the vertebral body. The interface between these 2 components revealed an air–fluid level (small black arrowheads). D, Sagittal T2-weighted turbo spin-echo MR image of another 76-year-old man who was diagnosed with osteonecrosis at T12 vertebral body. There coexists both intravertebral fluid (most, arrowhead) and air (minority, arrow) in the affected vertebral body.
