Is thrombus in the saphenous vein considered a DVT?

• A. Yes. A thrombus in the saphenous vein is a DVT
• B. No. A thrombus in the saphenous vein is part of the superficial vein system, classifying it as superficial thrombophlebitis
• C. It depends on the size of the thrombus
• D. Only if symptoms are present

Answer: (B)

The key idea is the distinction between deep and superficial venous thrombosis. Deep vein thrombosis (DVT) involves the deep venous system of the leg (such as the femoral, popliteal, or tibial veins) and carries a higher risk of pulmonary embolism. The saphenous veins sit in the superficial venous system, not the deep system. Therefore a thrombus in the saphenous vein is considered superficial thrombophlebitis, not DVT. The important caveat is that if a clot in a superficial vein extends into a deep vein, then deep venous thrombosis can occur, but by definition the thrombosis in the saphenous vein itself is superficial. Size of the thrombus or presence of symptoms does not change this classification. In practice, superficial thrombophlebitis is often managed with local measures and anti-inflammatory approaches, while DVT requires evaluation for anticoagulation and risk of embolism.