NCCN Guidelines for Patients
Stomach Cancer, Version 1.2016
Preparing for treatment
Sometimes CT is combined with another imaging test
called PET (
used to together, they are called a PET/CT scan.
PET/CT is advised when there may be metastases
but a CT scan didn’t detect any.
PET/CT may be done with one or two machines
depending on the cancer center. Before PET, you
must fast for 4 hours or more. There may be other
limits to your diet. About an hour before the scan, you
will be injected with a sugar radiotracer.
The radiotracer emits a small amount of energy that
is detected by the imaging machine. Cancer appears
brighter in the pictures because cancer cells use
sugar more quickly than normal cells. PET can show
even small amounts of cancer because the images
are based on the cells’ use of sugar (cell metabolism).
Upper GI endoscopy
An upper GI endoscopy allows your doctor to see
inside your esophagus and stomach. It is also called
an EGD (
uodenoscopy). For this test,
a tool called an endoscope is used.
Part of the endoscope will be guided down your
mouth. This part looks like a thin, long tube that is a
little thicker than a pencil.
See Figure 7
. You will
likely be sedated and thus unaware while the test is
At the tip of the endoscope is a light and camera that
allows your doctor to see. Your doctor will record
where the tumor is in your stomach or esophagus. If
the tumor is near the esophagus, the distance from
the EGJ may also be recorded.
Upper GI endoscopy
“Scopes” are tools that are
inserted into your body to let your
doctor see live video of inside
your body. An endoscope is one
such tool that is guided down your
mouth into your stomach. It allows
your doctor to see the inner wall
of your stomach and esophagus.
If ultrasound is used, your doctor
will be able to see the deeper wall
layers and nearby organs.
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