Lung, passive congestion, acute & chronic

This is an example of the lung in left sided heart failure. When the left ventricle begins to fail the lungs become congested with blood because the left ventricle cannot keep up with the right ventricle.

Eventually this leads to pulmonary hypertension and the right ventricle also fails resulting in congestion of the liver and other parts of the body. This is a very common cause of clinical morbidity in the U.S.