An injection of green dye is being used to reveal early signs of a common complication of breast cancer treatment, helping to prevent it.
Lymphoedema, which causes debilitating swelling, affects more than 200,000 people in Britain and is caused by a problem with the lymphatic system, a network of tiny vessels that drains fluid — lymph — from the tissues into the bloodstream.
If the fluid does not return to the bloodstream, it accumulates in the tissues, resulting in swelling, most commonly in the arms or legs.
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