What the difference between a pulmonary edema and pulmonary embolism?

Clot verus fluid: A pulmonary embolism is when a blood clot usually from the vein in the legs/ pelvis breaks off and lodges in the pulmonary arteries. This causes a strain on the right ventricle ( the part of the heart that pumps blood to the lung, along with several other problems. Pulmonary edema is fluid build up in the lungs, usually from heart failure but there are other causes. Symptoms can overlap.

Difference...: Pulmonary edema is excess fluid in the lungs whereas pulmonary embolus is a blood clot in the pulmonary vascular system. They are very different but a pulmonary embolus is one of the many, many causes of pulmonary edema.

Fluid vs Clot: Pulmonary edema is a swelling and fluid accumulation in the lung tissue. A pulmonary embolism is a clot that has travelled (usually) from the legs, through the blood stream, and lodged in the circulation of the lung.

Another thought: The formation of a clot in the lung may originate in the lung as well. If there is underlying lung disease or cardiac disease, then these are risk factors potentially for the formation of an embolism.