80-year-old female patient with right hip pain x3 days after bone marrow biopsy. There is diffuse heterogeneity of the bone marrow with decreased T1 signal intensity compatible with cellular replacement of marrow. There is increased signal intensity about the inferior right sacroiliac joint. Although there is no associated linear T1 signal abnormality, there is concern for insufficiency fracture given patient's history and appearance on STIR imaging. Moderate osteoarthritis affects the bilateral hip joints.
Findings concerning for right sacroiliac joint insufficiency fracture. Bone marrow replacement and heterogeneity as described above.