Trauma to the chest, abdomen, and pelvis is evaluated initially by plain films of the affected site, with contrasted CT afterwards to evaluate the soft tissues more completely. Plain films are particularly useful for detection of fracture and pneumothorax. Oral contrast is not usually given since time is of the essence. If injury to the aorta is suspected the patient may receive either a contrasted CT with angiographic protocol or immediate angiography; this decision may be influenced by the plain film of the chest and the degree of clinical suspicion for significant injury.