Deep Vein Thrombosis (DVT) Support Group
Deep-vein thrombosis, also known as deep-venous thrombosis or DVT, is the formation of a blood clot ("thrombus") in a deep vein. It can be caused by something preventing blood from circulating or clotting normally. Join the support group if you are coping with DVT and find others who are going through the same challenges.
Has he ever had the leg scanned? It is possible that there is still residual clot there. Doesn't always happen like that, but sometimes.
It IS most likely that a DVT caused his PEs because it is very rare for clots to form in the lungs themselves. Usually, they had to travel from elsewhere in the body. The question then becomes what would have caused a DVT, assuming that he had one?