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 Indian J Med Microbiol  
 

Figure 10 (A and B): Acute-on-chronic sacroiliitis. (A) Coronal oblique T1W MR image without fat suppression in a 39 year old female with ankylosing spondylitis shows fat deposition on both sacral sides (black arrows) and iliac sides (white arrows). (B) Corresponding STIR images through sacroiliac joint show subchondral edema (active sacroiliitis) (white arrows), areas of fat suppression (chronic sacroiliitis) (black arrows), and synovitis (thick white arrows)

Figure 10 (A and B): Acute-on-chronic sacroiliitis. (A) Coronal oblique T1W MR image without fat suppression in a 39 year old female with ankylosing spondylitis shows fat deposition on both sacral sides (black arrows) and iliac sides (white arrows). (B) Corresponding STIR images through sacroiliac joint show subchondral edema (active sacroiliitis) (white arrows), areas of fat suppression (chronic sacroiliitis) (black arrows), and synovitis (thick white arrows)