Figure 9a.
Axial CT images with intravenous contrast material obtained before (a) and after (b) the administration of rectal contrast material in a 27-year-old man with penetrating rectal trauma from a foreign body show a transmural defect (red arrow) with a focal collection of free air (white arrow in a) that was confirmed with rectal contrast material, demonstrating extraluminal leakage through the defect in b.