Dagger sign (spine)
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The dagger sign is a radiographic feature seen in ankylosing spondylitis as a single central radiodense line on frontal radiographs related to ossification of the supraspinous and interspinous ligaments secondary to enthesitis 1. It is possible for the radiodense line to extend into the sacrum 2.
On plain frontal radiographs it is noted as a linear increased density running along the spinous processes 3.
- 1. Antoinette Reinders, Matthys J van Wyk. Bamboo spine – X-ray findings of ankylosing spondylitis revisited. (2012) South African Journal of Radiology. 16 (3): 111. Antoinette Reinders, Matthys J van Wyk. Bamboo spine – X-ray findings of ankylosing spondylitis revisited. (2012) South African Journal of Radiology. 16 (3): 111. doi:10.4102/sajr.v16i3.294
- 2. Olivieri, I., Ciancio, G., Scarano, E., & Padula, A. (2000). The extension of the ankylosing spondylitis "dagger sign" into the sacrum. The Journal of rheumatology, 27(12), 2944–2945.
- 3. Maizlin Z, Kuruvilla M, Clement J, Vos P, Brown J. Radiologic Signs of Weapons and Munitions: How Will Noncombatants Recognize Them? AJR Am J Roentgenol. 2010;195(2):W96-W104. doi:10.2214/ajr.09.4029 - Pubmed