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Cross-section of axial CT scan showing abscess penetration into psoas muscle.
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CT scan of the abdomen and pelvis revealed an enlarged fluid collection posterior to the liver measuring 6 x 10 cm and extending into the paraspinous musculature within 1.5 cm of the skin surface with a thin enhancing rim concerning for abscess (Fig. 1).
Axial image from CT scan done at first presentation. Peri-nephric fluid collection of right kidney seen at that time.
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She had a CT scan five weeks prior during a similar presentation to the emergency department with abdominal pain (Fig. 2).