The bowel normally contains variable amounts of air or gas (black). Only the inner aspect of the bowel that contains air can be visualized, while the outer limits of the bowel wall are impossible to see (normally). The large bowel (outlined in the left image) is...
Supine (left), upright (middle), left lateral decubitus (LLD = left side down). The anteroposterior (AP) radiograph is most commonly performed with the patient in the supine position, but the upright view can be useful in searching for free intraperitoneal air and/or...
Abdominal axial CT images showing normal liver and spleen parenchyma. Major blood vessels are labeled. [Courtesy of Dr. N. Jaffer]
