Contrast-enhanced MRI or, if unavailable, contrast-enhanced CT
When symptoms suggest an abscess, contrast-enhanced MRI or, if unavailable, contrast-enhanced CT is done. A fully developed abscess appears as an edematous mass with ring enhancement, which may be difficult to distinguish from a tumor or occasionally infarction; CT-guided aspiration, culture, surgical excision, or a combination may be necessary.
Culture results help direct antibiotic therapy