Test Overview
A lymph node
removes
to be looked at under a microscope
for signs of infection or a disease, such as cancer. Other tests may also be
used to check the lymph tissue sample, including a
, genetic tests, or tests to study the body's
(immunological tests).
Lymph nodes are part of the immune system. They are found in the neck,
behind the ears, in the armpits, and in the chest, belly, and groin. See a
picture of
and of the
.
Lymph nodes in healthy people are usually hard to
feel. But lymph nodes in the neck, armpit, or groin can get bigger and become
tender. Swollen lymph nodes usually mean an infection, but the swelling can
also be caused by a cut, scratch, insect bite, tattoo, a drug reaction, or
cancer.
There are several ways to do a lymph node biopsy. The
lymph node sample will be looked at under a microscope for problems.
- Fine-needle aspiration biopsy. Your doctor inserts a thin needle into a lymph node and removes a sample of cells.
- Core needle biopsy. Your doctor inserts a needle with a special tip and removes a sample of tissue about the size of a grain of rice.
- Open (surgical) biopsy. Your doctor will make a small cut in the skin and remove a lymph node. If more than one lymph node is taken, the biopsy is called a lymph
node dissection. Open biopsy and lymph node dissection let your doctor take a
bigger sample than a needle biopsy.