PMC6082325_01
CT and MRI of the pelvic area.. Notes: (A) Bone destruction of the right sacroiliac joint with perifocal abscess formation in the right iliac muscle (white arrows); (B) MRI of the pelvic area, axial short-TI inversion recovery, which shows diffuse thickening and increased signal intensity in the right iliacus muscle, as well as edema in the fat surrounding the muscle (white arrows).
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CT of the pelvic area showed bone destruction of the right sacroiliac joint with perifocal abscess formation in the right iliac muscle (Figure 1A). On day 4, magnetic resonance imaging of the pelvic area revealed increased signal intensity of the right sacroiliac joint and surrounding bone, and diffuse thickening and effusion surrounding the muscle (Figure 1B).
Gram staining of the pus (x1000).
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A diagnostic CT-guided percutaneous drainage of the abscess was performed, and Gram staining of the pus revealed Gram-positive diplococcus bacteria and polymorphonuclear leukocytes (Figure 2).