ankylosing spondylitis spine ct radiology

CT & MRI Findings in Ankylosing Spondylitis of the spine

Ankylosing spondylitis (AS), in the spine can involve the anterior and posterior elements. It usually commences anteriorly and as the disease progresses, posterior changes are seen. In these images we look at:

  • Corner erosions and Sclerosis. 

  • Syndesmophyte formation between vertebrae.

  • Fusion: Of some of the posterior spinal joints.

romanus lesion spine radiology shiny corner ankylosing spondylitis ct posterior facet fusion


The CT demonstrates sclerosis and some rounding of the corners of the vertebral bodies in keeping with Romanus Lesions in Ankylosing Spondylitis. Shiny corners refers to the sclerosis seen on CT.

spine ankylosing spondilitis corner erosion sclerosis fusion syndesmophyte radiology radedasia

CT Spine changes in Ankylosing Spondylitis:

Some early changes involving the vertebral body in ankylosing spondylitis:

    • Corner Erosion (Pink arrow)  & Sclerosis (Yellow arrow),


    • Fusion (Green arrow),


    • Syndesmophyte (Blue arrow).

ankylosing spondylitis CT spine posterior fusion costovertebral costotransverse fusion


  • This is a T1 weighted scan.

  • There is bilateral facet joint fusion and ankylosis (no joint space seen) in a patient with ankylosing spondylitis.

  • The high (white) signal seen in the facets is a chronic reactive change of fatty change post inflammation.

ankylosing spondylitis shiny corner costo transverse romanus lesion spine radiology


  • CT in a Patient with chronic spinal Ankylosing Spondylitis.

  • There is CostoTransverse (Green arrows) & CostoVertebral Fusion (Pink arrows).

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