Lymphedema (PDQ®): Supportive care - Patient Information [NCI] - General Information About Lymphedema
Tests that examine the lymph system are used to diagnose lymphedema.
It is important to make sure there are no other causes of swelling, such as infection or blood clots. The following tests and procedures may be used to diagnose lymphedema:
- Physical exam and history: An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient's health habits and past illnesses and treatments will also be taken.
- Lymphoscintigraphy: A procedure used to make pictures (called scintigrams) of the lymph system to check for blockages or anything else that seems unusual. A radioactive substance is injected under the skin, between the first and second fingers or toes of each hand or foot. The substance is taken up by the lymph vessels and detected by a scanner. The scanner makes images of the flow of the substance through the lymph system on a computer screen.
- MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body. This procedure is also called nuclear magnetic resonance imaging (NMRI).
The swollen arm or leg is usually measured and compared to the other arm or leg. Measurements are taken over time to see how well treatment is working.
A grading system is also used to diagnose and describe lymphedema. Grades 1, 2, 3, and 4 are based on size of the affected limb and how severe the signs and symptoms are.
Stages may be used to describe lymphedema.
- Stage I: The limb (arm or leg) is swollen and feels heavy. Pressing on the swollen area leaves a pit (dent). This stage of lymphedema may go away without treatment.
- Stage II: The limb is swollen and feels spongy. A condition called tissue fibrosis may develop and cause the limb to feel hard. Pressing on the swollen area does not leave a pit.
- Stage III: This is the most advanced stage. The swollen limb may be very large. Stage III lymphedema rarely occurs in breast cancer patients. Stage III is also called lymphostatic elephantiasis.