Post-Thrombotic Syndrome
After a deep vein thrombosis, residual obstruction or damage to venous valves can lead to persistent swelling, heaviness, pain, skin changes or venous ulcers.
Treatments → Complex Venous Disease
Deep & pelvic venous expertise
Complex Venous Disease.
Specialist evaluation and individualized treatment for deep, pelvic and central venous conditions—from previous thrombosis and venous obstruction to complex reflux pathways.
Advanced venous assessmentDeep veins + pelvic veins + venous outflow
Understanding complex venous disease
When symptoms extend beyond surface veins.
Complex venous disease can result from obstruction, previous thrombosis, damaged valves or abnormal pelvic venous pathways. Because similar symptoms may have different causes, treatment begins by matching the patient’s history and examination with precise venous imaging.
Conditions assessed
Deep and pelvic venous problems require a complete view.
Iliac Vein Obstruction
Narrowing or blockage of the major veins in the pelvis can impair blood return from one or both legs. Causes include previous thrombosis, scarring or external compression.
May–Thurner Syndrome
In this anatomical compression pattern, the left iliac vein is compressed in the pelvis. It may cause no symptoms, or contribute to left-leg swelling, discomfort and deep vein thrombosis.
Pelvic Venous Disorders
Abnormal reflux or obstruction in pelvic veins may cause chronic pelvic heaviness or pain and atypical varicose veins around the pelvis, groin or upper thigh.
Acute and Recurrent Deep Vein Thrombosis
A clot in a deep vein requires timely diagnosis. Treatment aims to prevent clot extension and pulmonary embolism while reducing the risk of long-term venous damage.
Central and Upper-Extremity Venous Obstruction
Narrowing or thrombosis of veins in the chest, shoulder or arm can cause swelling, visible collateral veins and discomfort, particularly after previous venous catheters or devices.
Advanced venous assessment
Diagnosis before intervention.
An anatomical finding alone does not always explain a patient’s symptoms. Clinical relevance is established by combining history, examination and appropriate imaging.
Detailed consultation
The symptom pattern and venous history are reviewed carefully.
- Current symptoms, their duration and effect on daily life
- Previous deep vein thrombosis or pulmonary embolism
- Previous venous procedures, stents, catheters or operations
- Medication, anticoagulation and bleeding risk
- Pregnancy history and symptoms suggesting a pelvic venous source
- Cancer, inflammatory disease and other clotting risk factors
Duplex ultrasound
Ultrasound evaluates deep and superficial vein patency, reflux, residual thrombosis and blood-flow patterns without radiation.
Cross-sectional imaging
CT or MR venography may define pelvic and central venous anatomy, obstruction, collateral pathways and surrounding structures.
Venography and intravascular ultrasound
For selected patients being considered for intervention, catheter venography and intravascular ultrasound may provide detailed information from inside the vein.
Conservative management
Supporting venous return in daily life.
These measures may reduce symptoms and support long-term venous health. They do not replace urgent assessment for a suspected blood clot or specialist evaluation of persistent symptoms.
01
Regular walking and calf-muscle activity
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Avoiding prolonged immobility when possible
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Individualized medical compression
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Leg elevation for swelling when appropriate
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Weight management and smoking cessation
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Skin care and early treatment of venous wounds
Your treatment journey
From complex symptoms to a clear plan.
Specialist consultation
Symptoms, previous thrombosis, interventions, medication and personal priorities are reviewed in detail.
Targeted venous imaging
Duplex ultrasound is often the first examination. CT or MR venography may be added when pelvic or central veins require assessment.
Individual treatment decision
The clinical findings and imaging are considered together. Treatment is recommended only when the likely benefit justifies the risks.
Follow-up and prevention
Symptoms, access sites and any treated vein or stent are reviewed. Anticoagulation, compression and surveillance are individualized.
Frequently asked questions
Clear answers for complex venous conditions.
Recommendations depend on symptoms, previous thrombosis, medical risks and the findings of targeted imaging.
What makes a venous condition ‘complex’?+
Complex venous disease usually involves deep, pelvic or central veins, previous thrombosis, unusual venous anatomy, recurrent symptoms or several connected causes that require advanced imaging and individualized planning.
Is duplex ultrasound always enough?+
Duplex ultrasound is the first-line test for many venous problems. CT venography, MR venography, catheter venography or intravascular ultrasound may be needed when the pelvic or central veins cannot be assessed fully from the outside.
Does every iliac vein compression require a stent?+
No. Anatomical compression can exist without causing disease. Intervention is considered only when symptoms, clinical findings and imaging support a clinically significant obstruction and the expected benefit outweighs the risks.
Can symptoms continue after a DVT?+
Yes. Some patients develop post-thrombotic syndrome because of persistent obstruction or valve damage. Symptoms may include swelling, heaviness, pain, skin changes and, in advanced cases, venous ulceration.
Can pelvic venous disease cause leg varicose veins?+
Yes. Pelvic reflux or obstruction can contribute to atypical or recurrent varicose veins around the pelvis, groin or upper thigh. The source should be identified before treatment is planned.
How is a deep vein thrombosis treated?+
Anticoagulation is the main treatment for most patients. A smaller group with extensive, recent thrombosis and severe symptoms may be assessed for an additional catheter-based procedure.
Will I need long-term follow-up?+
Follow-up depends on the diagnosis and treatment. Patients with recurrent thrombosis, a venous stent, ongoing anticoagulation or chronic venous symptoms may require structured surveillance.
When to seek specialist advice
Symptoms that deserve venous assessment.
- Persistent swelling affecting one leg more than the other
- Leg heaviness or pain that worsens during the day
- Symptoms continuing after a previous deep vein thrombosis
- Skin discolouration, hardening or a venous ulcer
- Recurrent varicose veins in an unusual distribution
- Chronic pelvic heaviness or pain with visible pelvic-origin veins
- Arm, neck or facial swelling after a venous catheter or device
- Recurrent or unexplained venous thrombosis
The information on this page is intended for general patient education and does not replace an individual medical examination, diagnosis or treatment recommendation. Procedure suitability and availability depend on the clinical indication and treating hospital.