<unk>  <unk>  is a sudden blockage in an artery within the lungs. The blockage usually is caused by a blood clot that travels to the lung from a vein in the leg. This clot blocks blood flow to part of the lung, and if the clot is large or if there are numerous clots, it may be fatal.
Pulmonary embolism
Pulmonary hemorrhage
Pleural effusion
Lung infarction
Pulmonary aspiration
Air embolism
Aspiration pneumonia
Pleurisy