What is the difference between pneumonia and pulmonary edema?

Infection vs Fluid. Accumulation. Pneumonia means you have an infection in your lungs. Where as pulmonary edema reflects fluid accumulation in your lungs.
Fluid versus infect. Pulmonary edema is fluid in the lung from any cause, sometimes related to impaired heart function, but also seen with a number of other causes of inflammation in the lung, such as smoke inhalation, trauma, and severe infections including pneumonia. Pneumonia is a lung infection. The two entities can coexist and may look similar on chest xray.