Figure 4. The larger of two chest wall swellings in a 25-year-old man located on the posterolateral aspect of the rib cage appears contiguous with an intrathoracic component, which confers a scalloped configuration to adjacent liver contour. Drainage of the smaller lesion on the anterior chest wall had led to the formation of a discharging sinus. A lung abscess was present within the upper lobe of the right side.