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Added by Christian Veillette , last edited by Christian Veillette on Sep 06, 2008  (view change)
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Location Spine
Diagnosis Ankylosing Spondylitis
Discussion Single frontal radiograph of the lumbar spine in a patient with bony fusion of the adjacent lumbar vertebrae with syndesmophyte formation, characteristic for ankylosing spondylitis. In addition, there is a linear increased density running along the spinous processes. The dagger sign is a single central radiodense line on frontal radiographs related to ossification of supraspinous and interspinous ligaments.
Reference Resnick D, Niwayama G.: Ankylosing Spondylitis. Resnick D. Bone and Joint Imaging, 1st Edition, Phyladelphia, Resnick D. W.B. Saunders 1989:299-319.
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Dagger Sign
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