Vascular Malformations

Vascular malformations differ from vascular tumours and may involve veins, arteries, capillaries, lymphatic channels or a combination. Symptoms range from a visible birthmark or soft swelling to pain, bleeding, skin damage, limb enlargement or, with extensive high-flow lesions, strain on the heart.

Venous malformations

Venous malformations are low-flow lesions that may appear blue, soft and compressible. They can enlarge with growth, pregnancy or trauma and may cause pain, swelling or episodes of localised clotting within the lesion.

Arteriovenous malformations

Arteriovenous malformations (AVMs) contain abnormal high-flow connections between arteries and veins. They may feel warm or pulsatile and can cause pain, bleeding, skin ulceration or, when extensive, cardiovascular strain.

Lymphatic and combined malformations

Lymphatic malformations contain abnormal lymphatic channels and may cause swelling, recurrent infection or fluid-filled cysts. Some lesions contain several vessel types and behave accordingly.

Presentations include a visible birthmark or mass, pain, swelling, warmth, bleeding, recurrent clotting within the lesion, skin breakdown, limb enlargement or pressure effects on nearby structures. Lesions can change with hormonal shifts, growth spurts, pregnancy or trauma.

Sudden severe pain, significant bleeding or rapid enlargement should be assessed urgently rather than at the next routine review.

Diagnosis rests on clinical examination and imaging. Duplex ultrasound establishes whether a lesion is high-flow or low-flow; MRI is usually the best test for defining its full extent through skin, muscle and deeper tissues; and CT angiography or catheter angiography is reserved for complex high-flow lesions and treatment planning.

Getting the classification right at the start matters, because low-flow and high-flow lesions are treated in fundamentally different ways.

Observation and symptom management

Small, stable malformations causing few symptoms may simply be monitored. Compression garments, pain management, skin care and treatment of localised clotting can control symptoms without a procedure.

Sclerotherapy and embolisation

Sclerotherapy closes abnormal low-flow channels with an injected agent. Embolisation blocks high-flow connections and may be performed alone or to prepare for surgery. Several staged sessions are commonly needed, planned as a course rather than a single fix.

Surgical treatment

Surgery can remove a localised malformation or address tissue damaged by one. Complete removal is not always possible where the lesion involves important nerves, muscles or organs, and partial, function-preserving treatment is sometimes the better choice.

Multidisciplinary care

Depending on age and anatomy, care may involve vascular surgeons, interventional radiologists, plastic surgeons, dermatologists, paediatric specialists and others, with the plan built around the person rather than the lesion alone.

Because abnormal channels often extend beyond what is visible, incomplete treatment can be followed by recurrence, and long-term review with periodic imaging is usual. Intervention itself can cause bleeding, skin injury, nerve damage, thrombosis or swelling. Patients should report new pain, rapid growth, bleeding or skin breakdown between planned reviews.

Practical planning begins with an accurate classification of the malformation as low-flow or high-flow and an understanding of how deeply it extends. Lesions of similar size can behave very differently depending on the vessels involved, their location and their relationship to muscles, nerves, skin and nearby organs.

Not every malformation requires immediate treatment. Observation, compression and symptom management may be preferable when a lesion is stable and intervention would create more risk than benefit. When treatment is recommended, patients should understand whether the aim is control rather than complete removal and whether sclerotherapy, embolisation, surgery or a staged combination is proposed.

Several procedures over months or years may be needed, particularly for extensive lesions. Recurrence or regrowth can occur because abnormal channels may extend beyond what is visible or safely treatable. Previous MRI, ultrasound and procedural reports are particularly valuable, and the consultation should clarify which specialists will be involved, how response will be assessed and what changes should prompt earlier review.

Yarra Vascular Surgeons assesses vascular malformations with flow-focused imaging and coordinates observation, compression, sclerotherapy, embolisation, surgery or staged combined treatment within a multidisciplinary framework.

Vascular malformations vary widely in flow, extent and clinical behaviour, so treatment must be based on precise imaging and the symptoms caused by the lesion. Yarra Vascular Surgeons provides assessment within a multidisciplinary framework and can coordinate surveillance, compression, sclerotherapy, embolisation, surgery or staged combined treatment for appropriately selected patients.