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"MR Corner Sign": Value for Predicting Presence of Ankylosing Spondylitis

Na Ra Kim1, Ja-Young Choi1, Sung Hwan Hong1, Woo Sun Jun1, Joon Woo Lee2, Jung-Ah Choi2 and Heung Sik Kang2

1 Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine, 28, Yongon-dong, Chongno-gu, Seoul 110-744, Korea.
2 Department of Radiology, Seoul National University Bundang Hospital, Seoul, Korea.


Figure 1
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  		Fig. 1A —33-year-old man with ankylosing spondylitis. T2-weighted (A) and T1-weighted (B) sagittal images show multiple-quadrant MR corner lesions (arrowheads) in anterior corners at L1–L2, L2–L3, and L3–L4 and triangular MR corner lesions (arrows) in anterior corners at T12–L1 and L2–L3 and posterior corner at L2–L3.

 

Figure 2
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  		Fig. 1B —33-year-old man with ankylosing spondylitis. T2-weighted (A) and T1-weighted (B) sagittal images show multiple-quadrant MR corner lesions (arrowheads) in anterior corners at L1–L2, L2–L3, and L3–L4 and triangular MR corner lesions (arrows) in anterior corners at T12–L1 and L2–L3 and posterior corner at L2–L3.

 

Figure 3
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  		Fig. 2A —53-year-old man with degenerative corner lesions. T2-weighted (A) and T1-weighted (B) sagittal images show semicircular corner lesion of Modic type II change with disk degeneration and osteophytes at L4–L5 (arrows).

 

Figure 4
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  		Fig. 2B —53-year-old man with degenerative corner lesions. T2-weighted (A) and T1-weighted (B) sagittal images show semicircular corner lesion of Modic type II change with disk degeneration and osteophytes at L4–L5 (arrows).

 

Figure 5
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  		Fig. 3A —31-year-old man with ankylosing spondylitis. T2-weighted (A) and T1-weighted (B) sagittal images reveal multiple sharply marginated triangular MR corner lesions with Modic type II changes (arrowheads) in anterior and posterior corners from L1 to L4.

 

Figure 6
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  		Fig. 3B —31-year-old man with ankylosing spondylitis. T2-weighted (A) and T1-weighted (B) sagittal images reveal multiple sharply marginated triangular MR corner lesions with Modic type II changes (arrowheads) in anterior and posterior corners from L1 to L4.

 

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