Preferred Label : trolley-track sign;
RADLEX synonyms : tram-track sign;
Definition : One central dense line and two peripheral dense lines are seen running longitudinally
on frontal radiograph of the spine. Suggests ankylosing spondylitis; ossified supraspinous
and interspinous ligaments make up the central line, and ossified apophyseal joint
capsules make up the lateral lines.;
Origin ID : RID35659;
Associated condition(s)
One central dense line and two peripheral dense lines are seen running longitudinally
on frontal radiograph of the spine. Suggests ankylosing spondylitis; ossified supraspinous
and interspinous ligaments make up the central line, and ossified apophyseal joint
capsules make up the lateral lines.
