LATERAL VIEW OF X-RAY CHEST
The
lateral view is the most important supplement to standard PA chest radiograph
since much of the lung and mediastinum is hidden on the PA film. Right or left
lateral view, depending on the area of interest closer to the film is obtained.
The lateral view helps in localization of different lobes and segment and often
this is the only view that will provide this information. Important
observations on lateral film of the chest include the clear space, vertebral
translucency and outline of diaphragms. There are two space of increased
translucency where both lung lie closest. There are retrosternal and
retrocardiac area. Retrosternal space normally measures less than 3 cm at its
widest point. Vertebral bodies normally are progressively more translucent
caudally because of increase in the volume of aerated lung overlying the spine.
Both diaphragms are visible throughout their length except the left anteriorly
where it merges with the heart.
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Right lateral X-ray of normal chest
The diaphragm of the side
closer to the film is also more sharply defined. The ribs of the side away from
the film appear wider.
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