2. This oblique view of a normal
barium swallow shows the
normal impressions made by
the (A) aortic arch, (B) left
mainstem bronchus, and (LA)
left atrium on the esophagus.
3. A. Mucosal relief view. With
the esophagus collapsed and
coated, the normal
longitudinal folds are seen.
B. Single-contrast view. With
the patient continuously
drinking barium in the prone
position, the barium-filled
esophagus is demonstrated.
C. Double-contrast view.
With the patient in the
upright position, the
smooth, featureless surface
of the esophagus is seen.