Pathogenesis of Chronic Venous Congestion in Lungs?
I think CVC lead to Pulmonary congestion and edema.
They produce heavy, wet lungs. 

Pulmonary changes include 


perivascular and interstitial edema, particularly in the interlobular septa;
progessive edematous widening of alveolar septa; and 
accumulation of edema fluid in alveolar spaces which contain Hemosiderin and microhemorrhages


Now, the progression of the disease to heart should be discussed.
I am not sure if hemosiderin can go directly from lungs to heart or if it has to travel through circulation and then to left-side of lung.