The left lateral view in the plain-film assessment of abdominal distension.

Since the left lateral position facilitates the entry of air into the rectosigmoid, it has been employed in the plain-film evaluation of patients with abdominal distension. The value of this view is illustrated by examples of patients with (a) colonic ileus due to imipramine hydrochloride (Tofranil) or chlorpromazine, (b) partial mechanical obstruction due to diverticulitis, (c) involvement of the rectum by Hirschsprung's disease, and (d) sequential evaluation of a patient with clindamycin colitis. This simple maneuver is recommended for (a) evaluation of patients with plain-film evidence of low colonic obstruction, (b) problems of differential diagnosis between bowel obstruction and ileus, and (c) evaluation of patients with conditions affecting the rectosigmoid.