Diagnosing
a tumor in the pancreas is sometimes difficult. Symptoms are not always
obvious, and usually develop gradually. Many medical tests are used
to diagnose pancreatic cancer and to find out whether it has spread
beyond the pancreas.
The following tests and others may be used to find out whether
you have pancreatic cancer and whether it has spread. If you have
questions about these tests, ask your doctor or nurse.
Blood tests. These
tests measure the function of the liver and other organs.
No single blood test can diagnose pancreatic cancer at the present
time. M. D. Anderson and other institutions are doing research that
may result in such a test in the future. For information about this
research see the
PTSG Clinical Trials Page: Early Detection Study.
Ultrasound. This
test uses sound waves to form a picture that can be seen on a small
television screen. The picture can show the size of the pancreas
and possibly the presence of a tumor. Ultrasound is commonly performed
by placing a probe on the surface of the abdomen. Improved technology
also allows ultrasound probes to be placed at the end of endoscopes
that are passed into the stomach and duodenum (see ERCP below).
Endoscopic ultrasound (EUS) can be done at the time of ERCP, and
can be used to biopsy (sample) the pancreas.
Computerized tomography (CT) scan.
By means of a special type of X-ray machine, this test gives detailed
pictures of the body and can show how far cancer has spread. The
CT scan is the primary test used to determine whether the tumor
can be surgically removed.
Endoscopic retrograde cholangiopancreatography
(ERCP). During this test, a flexible tube is guided
down the throat, through the stomach, and into the small intestine.
The doctor can see through the tube and inject dye into the bile
duct and pancreatic duct (Figure 1) as X-rays are taken. This test
can show narrowing of these ducts due to pressure from the tumor.
A small tube called a stent can be placed into the bile duct across
any blockage to relieve jaundice (yellowing). To view a video about
ERCP, call MDA-TV, 792-7287, and ask for video #972-1-91.
Fine needle aspiration (FNA).
If a tumor has been identified, it can be sampled (or biopsied)
in one of two ways: under the guidance of endoscopic ultrasound
(EUS) or CT.
Endoscopic Ultrasound (EUS).
EUS-guided FNA is performed with a special endoscope that is equipped
with an ultrasound probe to enable the doctor to see the tumor.
A small needle at the end of the endoscope can be used to biopsy
the tumor.
When FNA is performed under CT guidance, a doctor will guide a
small needle through the skin and abdomen and into the pancreas
after injecting some local anesthesia. A CT scan helps the doctor
find the exact location of the tumor. The procedure in which these
cells are obtained and then examined under a microscope is called
a biopsy.
Angiography. This
test studies the blood vessels in and around the pancreas. It is
done in the X-ray department with the aid of local anesthesia. A
small catheter is placed into the artery in the upper thigh. Dye
is injected into the blood vessels leading to the pancreas, and
X-rays are taken. These pictures can help the surgeon plan your
operation.
Laparoscopy. This
test is done in the operating room under general anesthesia. The
surgeon guides a small camera through a half-inch incision in your
abdomen. The organs in the abdomen can then be examined directly.
This test is done to find out if the pancreatic tumor has spread
to other organs or structures.
Note: The patient usually does not need to spend the night at the
hospital to complete any of the tests described above. Exploratory
surgery is rarely done to diagnose pancreatic tumors or other abnormal
conditions.