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. Author manuscript; available in PMC: 2022 Mar 1.
Published in final edited form as: AJR Am J Roentgenol. 2021 Jan 21;216(3):585–598. doi: 10.2214/AJR.20.22783

Fig. 5—

Fig. 5—

24-year-old man with groin and buttock pain for 1 year. Case emphasizes importance of screening for extraarticular hip abnormalities in young patients with suspected femoroacetabular impingement.

A, Anteroposterior radiograph of pelvis shows cam deformity (arrow) and normal acetabular coverage. Subtle subchondral sclerosis (arrowheads) of right sacroiliac joint is evident. MR arthrography revealed intact labrum and cartilage (not shown).

B, Axial STIR MR image of pelvis shows evidence of periarticular osteitis (asterisk), joint effusion, subchondral erosions of right sacroiliac joint, and subtle edema and sclerosis on left side (arrowheads). Patient was referred to rheumatologist, who confirmed diagnosis of seronegative spondyloarthritis.