NCCN Guidelines for Patients
Lung Cancer Screening, Version 1.2017
Why get screened?
The lungs are a pair of organs in the chest that are
vital to life. The lungs move important gases in and
out of the blood. You breathe in oxygen and let out
carbon dioxide (a toxic gas) from the body.
The lungs have sections called lobes. The left lung
has 2 lobes and the right lung has 3 lobes. A thin
layer of tissue (membrane) surrounds the lungs
called the pleural membrane.
The two large breathing tubes that go from the
windpipe (trachea) to the lungs are called bronchi.
A single tube is called a bronchus. Then inside of
the lungs are small tubes (bronchioles) and small air
See Figure 1
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Figure 1. The lungs
The lungs have sections called lobes. The left lung has 2 lobes and the right lung has 3 lobes.