Fatty lesions and erosions on MRI of the sacroiliac joint

Coronal oblique MRI views of sacroiliac joints.
(A) T1-weighted image: arrows indicate fatty lesions; arrowheads indicate erosions.
(B) T2 fat-suppression image: arrows indicate changes of bone marrow edema.

MRI: magnetic resonance imaging.

Courtesy of Dr. Zheng Zhao, PLA Hospital, Beijing, China.

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