High-Flow Vascular Malformations

About High-Flow Vascular Malformations

Arteriovenous malformations are high-flow vascular anomalies in which arteries and veins are tangled together without the normal capillary buffer between them. This direct shunt forces blood to pass through too quickly, depriving surrounding tissues of oxygen and putting nearby vessels under strain. AVMs in the brain are widely known, but plastic surgeons frequently see them on the face, scalp, hands and feet. They can be superficial or deep, with deeper lesions often involving muscle and bone.

Symptoms vary by site and depth. A pulsating swelling, warmth over the area, a visible bluish or reddish blush, audible bruit and intermittent bleeding are common findings. Pain, ulceration and overgrowth of the affected limb or facial region may develop as the AVM enlarges. Some lesions stay quiet for years before rapid expansion in adolescence, pregnancy or after minor trauma. Untreated, they can erode skin, involve major vessels and threaten the function of vital organs nearby.

AVM treatment is highly individualised. In adults, a wait-and-see approach is rarely advisable, since complications increase as the lesion grows. Imaging with MRI maps the lesion in all dimensions, while angiography defines the feeding vessels. Treatment usually combines embolisation, performed by an interventional radiologist, with surgical excision led by Dr. Agarwal, FRCS Edinburgh. Embolisation reduces blood flow into the lesion just before surgery, so excision can be performed safely with controlled bleeding and clean margins.

Surgery is the treatment of choice for accessible AVMs. The lesion is identified, feeder vessels are ligated and the malformation is removed, sometimes along with overlying skin if it is too damaged. Reconstruction with flaps may be needed for facial and limb sites. When a lesion involves vital organs or major vessels in a way that surgery would cause unacceptable functional loss, we may decide against surgery and choose conservative or staged interventional management instead, with full discussion of the trade-offs.

What to expect

• Detailed clinical exam noting pulsation, warmth and bruit
• MRI to map anatomical extent and angiography to define feeders
• Multidisciplinary planning with interventional radiology
• Pre-operative embolisation to reduce blood flow into the lesion
• Surgical excision with feeder ligation under general anaesthesia
• Reconstruction with grafts or flaps where soft tissue is removed
• Long-term follow-up to detect any early recurrence

Recovery

• Hospital stay of two to four nights depending on extent
• Early swelling and bruising settle over two to three weeks
• Wound care and gentle activity restriction for the first month
• Most desk-job patients return to work in three to four weeks
• Imaging review at three to six months to look for residual disease
• Long-term photographic and imaging follow-up safeguards results