Normal findings from the sacroiliac joints.
Fluid in the right sacroiliac joint, bone marrow edema, periarticular muscle edema.
Muscle edema along iliopsoas muscle (long arrows), irregularity and small bone erosions (small arrows).
Expansion of bone marrow edema.
Bone marrow edema, as low-intensity signal in ilium and sacrum (arrows).
Bone marrow enhancement within right ilium and sacrum and sacroiliac joint space enhancement.
Remission of muscle edema.
Remission of bone marrow edema, effacement of muscle edema.