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Figure 24b. Subphrenic abscess. (a) Initial contrast-enhanced CT scan shows a grade IV injury involving the hepatic dome. The patient was treated conservatively. (b) Follow-up contrast-enhanced CT scan obtained 21 days later reveals a well-defined low-attenuation fluid collection in the subphrenic region (arrows). Percutaneous catheter drainage was performed because the patient complained of high fever. (c) Contrast-enhanced CT scan obtained 28 days after percutaneous catheter drainage shows complete resolution of the abscess cavity.