What is a saddle pulmonary embolus?

Cause and effect: An embolus is something that can float through blood and then plugs the flow. It's usually a blood clot or air. A pulmonary infarct occurs when the embolus goes to a pulmonary artery and the lung down stream dies from lack of oxygen. A saddle embolis is a clot bridging the main arteries to both the right and left lungs.

Saddle: A saddle pulmonary embolus is a relatively large clot that becomes lodged within the main pulmonary artery and straddles (extends into) both right and left pulmonary arteries.