Английская Википедия:Dagger sign

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Dagger sign is a radiologic sign seen in advanced cases of ankylosing spondylitis.[1] The appearance of a dagger is seen in the X-ray because of ossification of the supraspinous and infraspinous ligaments.[2] As a result, a central dense line of sclerosis, resembling a dagger can be seen in the AP radiograph of spine and pelvis.[3]

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