Figure 1.

Imaging of abscess cavity debris rating. The degree of visualized detail for both US and CT images was rated using a 4-point scale. A rating of 1 corresponded to visualized changes in the soft tissue but no organized fluid collection. A rating of 2 corresponded to visualization of a discrete abscess cavity but no internal details (i.e. a homogenous center). A rating of 3 corresponded with visualization of heterogeneous contents of the abscess cavity without fine detail, and a rating of 4 corresponded with visualized fine details within the abscess cavity.