Deep vein thrombosis (DVT) is one of the most important differential diagnoses for acute unilateral leg pain. In this article you will learn risk factors, typical symptoms, differential diagnoses, diagnostics, therapy and possible complications such as pulmonary embolism — ideal for FSP, knowledge exam, M3 and clinical practice.

Tiefe Venenthrombose (TVT) – Differenzialdiagnosen, Risikofaktoren und Komplikationen

Main complaint

Typically, a patient over 40 presents with acute pain in one lower leg.

Risk factors

Immobilization after surgery or trauma
Varicose veins
Traumatic injury to the vessel wall
Pregnancy or puerperium
Long journeys or prolonged immobilization (e.g., long flights or bus trips)
Use of oral, estrogen-containing contraceptives
Malignancy
Inherited thrombophilias
Previous deep vein thrombosis or pulmonary embolism (risk of recurrence)
Obesity
Advanced age

Differential diagnoses

Condition	Typical symptoms	Diagnostics	Treatment
Deep vein thrombosis (DVT)	Swelling, pain, a feeling of tightness, warmth, tenderness along the deep veins, usually unilateral	Clinical examination (e.g., calf circumference difference > 3 cm), Payr, Homans and Meyer signs, Wells score, D-dimer, duplex/compression ultrasound	Anticoagulation (DOAC or LMWH, followed by oral anticoagulation), compression, mobilization; if pulmonary embolism is suspected, additional diagnostics
Superficial thrombophlebitis	Localized painful, reddened and warm venous cord, possibly swelling	Clinical examination, duplex ultrasound to exclude DVT	Cooling, NSAIDs, compression, topical or systemic heparin if indicated; antibiotics only for bacterial superinfection
Rupture of a Baker’s cyst	Sudden onset of pain and swelling in the popliteal fossa or calf, bruise-like discoloration, often after exertion	Ultrasound of the popliteal fossa or calf, possibly MRI	Rest, cooling, NSAIDs, aspiration or surgical therapy for recurrent cases
Erysipelas / Cellulitis	Redness, warmth, pain, often fever; erysipelas is sharply demarcated, cellulitis is diffuse	Clinical examination, laboratory (CRP, leukocytes), blood cultures if febrile	Systemic antibiotics, elevation and rest
Intermittent claudication (PAD)	Exercise-dependent calf pain, improvement at rest, often coldness and absent distal pulses	Ankle-brachial index (ABI), Doppler ultrasound, angiography	Walking exercise, risk factor control, antiplatelet therapy, revascularization if indicated

Further notes

In intermittent claudication multiple risk factors such as smoking, arterial hypertension, diabetes mellitus and hypercholesterolemia are often present.
The course is chronically progressive; symptoms typically occur on exertion.
In lumbosciatic pain a radiculopathy may be present, but back pain usually predominates rather than primary leg pain.