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25

NCCN Guidelines for Patients

®

Stomach Cancer, Version 1.2016

3

Preparing for treatment

Cancer tests

PET/CT scan

Sometimes CT is combined with another imaging test

called PET (

p

ositron

e

mission

t

omography). When

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 (

e

sopha

g

astro

d

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

occurring.

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.

Figure 7.

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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