Lasers and night-vision technology help improve imaging of hidden lymphatic system

The human lymphatic system is an important but poorly understood circulatory system consisting of tiny vessels spread throughout the body. This "drainage" network helps guard against infections and prevents swelling, which occasionally happens when disease or trauma interrupts normal lymphatic function. Chronic swelling is the hallmark of a painful, incurable condition known as lymphedema, which often occurs after cancer therapy and can leave the limbs and other body parts disfigured for life.

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