Pulmonary embolism. Gamma Camera scan (scintigram) of human lungs, showing an embolism. An embolism is the formation of a blood clot or other obstruction in an artery. Here, the left lung (at right on image) is affected by an embolus, revealed by the dark blue notch on the side of the lung. This lung also shows generalised restriction of its blood supply (white), compared with the normal right lung (yellow/brown). Emboli are clot fragments formed in other parts of the body that may lodge in a lung. Gamma scanning uses radioactive tracer (Technetium-99m) injected into the blood, and detected by a gamma camera.
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