Dr. Deodhar reminds us of his "3,4,5 rule" for diagnosing AS. *Erosions in 3 or more SIJ quadrants *BME in 4 or more SIJ quadrants *Fat lesions in 5 of more SIJ quadrants #RNL2023 @RheumNow https://t.co/6iAXKfZvEY https://t.co/kxqbiXVd2w