Axial T-2 weighted magnetic resonance imaging of lumbar spine after four weeks showing a recurrent abscess (*) measuring 3.2 x 1.3 centimeters. The lateral aspect of this collection extends beyond the field of view. The medial aspect of this collection appears continuous with the left sacroiliac joint (arrow), concerning for sacroilitis and possible involvement of the left iliac bone, although incompletely characterized on this study.