S-Space College of Medicine/School of Medicine (의과대학/대학원) Radiology (영상의학전공) Journal Papers (저널논문_영상의학전공)
"MR corner sign": value for predicting presence of ankylosing spondylitis
- Kim, Na Ra; Choi, Ja-Young; Hong, Sung Hwan; Jun, Woo Sun; Lee, Joon Woo; Choi, Jung-Ah; Kang, Heung Sik
- Issue Date
- American Roentgen Ray Society
- AJR Am J Roentgenol. 2008 ;191(1):124-8.
- Adult; Aged; Female; Humans; Lumbar Vertebrae/*pathology; Magnetic Resonance Imaging/*methods; Male; Middle Aged; Prognosis; Reproducibility of Results; Sensitivity and Specificity; Spondylitis, Ankylosing/*pathology
- OBJECTIVE: The purpose of this study was to evaluate the MRI features of the "MR corner sign" and to determine its diagnostic usefulness in ankylosing spondylitis. We reviewed the spinal MR images of 52 patients with ankylosing spondylitis and compared these images with those of 52 age- and sex-matched control subjects. CONCLUSION: The MR corner sign was defined as a triangular and sharply marginated corner abnormality in a vertebral body unassociated with osteophytes or Schmorl's node. MR corner lesions were significantly more common in the ankylosing spondylitis group than in the control group (Fisher's exact test, p < 0.001). The sensitivity, specificity, and positive and negative predictive values of the MR corner sign were 44%, 96%, 92%, and 63%, respectively. The most frequent feature of signal intensity was a Modic type II change (77%). In patients with ankylosing spondylitis, the MR corner sign was fre quently seen at the thoracolumbar junction, whereas degenerative corner lesions were commonly seen in the lower lumbar spine. When the MR corner sign is detected on spinal MR images in daily practice, it should not be overlooked because it suggests the possibility of ankylosing spondylitis, which should then be further evaluated.
- 1546-3141 (Electronic)
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