[Necrotic ulcers after per-operative sclerosing injection].

A crossectomy of the internal saphenous vein was performed without difficulty, followed by a back-flow injection into the crural internal saphenous with a 40% sodium salicylate solution. During the following days, deep scabs appeared on one-third of the thigh, with deterioration of the necrosed internal saphenous. There was a slow and painful cure within 5 months, without a large scar. This method of back-flow injection is rarely performed at present. The product injected can sclerose the collateral veins with skin lesions and cause a phlebitis of the femoral vein through injection of the communicating veins.