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Dagger sign

Dr MT Niknejad and Dr Frank Gaillard et al.

The dagger sign is a radiographic feature seen in ankylosing spondylitis as single central radiodense line on frontal radiographs related to ossification of supraspinous and interspinous ligaments.

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References

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1. Bone and joint imaging. Donald Resnick, Mark J. Kransdorf. Philadelphia, Pa. : Elsevier Saunders, c2005. ISBN:0721602703 (find it at amazon.com)