Examqo › Examqo library › Vascular surgery › Venous and lymphatic disease · IMLE
Superficial vein thrombosis (thrombophlebitis)
Superficial vein thrombosis of the leg is not a "minor problem" — a substantial share of patients also have DVT or embolism, so a whole-leg duplex is done; superficial thrombosis 5 cm or longer is treated with fondaparinux 2.5 mg daily for 45 days, and thrombosis reaching within 3 cm of the junction with the deep vein is treated as DVT.
Why it matters in the exam
Superficial vein thrombosis presents as a red, warm, hard, tender cord along a vein, usually a varicose vein of the leg. It was once treated as benign, but studies showed that about a quarter of patients have DVT or pulmonary embolism at diagnosis, and that the thrombus may progress into the deep vein through the junction between the great saphenous and femoral vein in the groin, or between the small saphenous and popliteal vein. So a whole-leg duplex is done: to measure the length of the thrombus, the distance from the deep junction, and to look for DVT. The CALISTO trial (2010) showed that fondaparinux 2.5 mg subcutaneously once daily for 45 days greatly reduced the risk of DVT and embolism in superficial thrombosis 5 cm or longer; rivaroxaban 10 mg daily is an alternative.
According to ESVS 2021 and CHEST 2021: short superficial thrombosis (less than 5 cm) far from the junction — symptomatic treatment (NSAIDs, warm compresses, compression stockings) and repeat duplex if symptoms progress; thrombosis of 5 cm or more — fondaparinux 2.5 mg for 45 days; thrombosis within 3 cm of the deep junction — full-dose treatment as for DVT, usually for 3 months. Superficial thrombosis without varicose veins, migratory or recurrent, requires a search for a cause: malignancy (Trousseau), Buerger disease, Behçet and thrombophilia. In the arm, superficial thrombosis is usually linked to an intravenous infusion: the catheter is removed and symptoms are treated; suppurative thrombophlebitis with fever and pus requires antibiotics and sometimes excision of the infected vein. Surgery (junction ligation) is not superior to anticoagulation in most cases.
After the thrombosis has settled, a patient whose varicose veins caused it needs assessment for varicose vein treatment to reduce recurrence.
Key points
- Whole-leg duplex.
- 5 cm or more — fondaparinux for 45 days.
- Within 3 cm of the junction — as DVT.
- Short and distant — symptomatic treatment.
- Migratory — look for a cause.
Summary table
| Situation | Treatment | Note |
|---|---|---|
| Less than 5 cm, far from the junction | NSAIDs, compresses, compression stockings | Repeat duplex if progressing |
| 5 cm or more | Fondaparinux 2.5 mg daily for 45 days | CALISTO |
| Within 3 cm of the deep junction | Full-dose anticoagulation as for DVT | Usually 3 months |
| Migratory or without varicose veins | Look for a cause | Malignancy, Buerger, Behçet, thrombophilia |
| Arm after infusion | Remove the catheter, treat symptoms | Suppurative — antibiotics and sometimes excision |
In the full version for subscribers
- A simple algorithm
- Memory aid
- Exam traps
- 5 review cards
- Enough for IMLE
The full version is open to subscribers of: Vascular surgery, Internal medicine, Family medicine, Medical licensing exam (IMLE).
Subscriber? Read the full topic Plans and prices 25 free questions
Sources
- ESVS Clinical Practice Guidelines on the Management of Venous Thrombosis, 2021 — Superficial vein thrombosis
- CHEST Guideline: Antithrombotic therapy for VTE disease, second update, 2021 — Superficial vein thrombosis
- Decousus et al., CALISTO, N Engl J Med, 2010 — Fondaparinux for the treatment of superficial-vein thrombosis in the legs
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.