K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Calcified lung lymph nodes. Coloured 3D computed tomography (CT) scan of the hilum of a human lung, showing calcified lymph nodes (purple). Lymph nodes are part of the lymphatic system. Calcified lymph nodes can have a variety of causes. The hilum of the lung is where the airways and blood vessels enter each lung.
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