Dr. Peter Lin
Dr. Peter Lin is a board certified vascular surgeon in Los Angeles. He served as Chief of Vascular Surgery at Baylor College of Medicine, and is well recognized as an innovator and expert in minimally-invasive vascular therapy.
Dr. Lin is actively involved in research, and has published more than 400 scholarly articles and book chapters in the field of vascular surgery. Selected publications by Dr. Lin are listed below.
A vascular malformation is a type of birthmark, or congenital (present at birth) vascular growth, made up of arteries, veins, capillaries or lymphatic vessels. There are several different types of malformations and they are named according to which type of blood vessel is predominantly affected. A vascular malformation is also known as lymphangioma, arteriovenous malformations, and vascular gigantism.
A hemangioma is another type of birthmark. It is the most common benign (non-cancerous) tumor of the skin. Hemangiomas may be present at birth (faint red mark) or may appear in the first months after birth. A hemangioma is also known as a port wine stain, strawberry hemangioma, and salmon patch. About 83 percent of hemangiomas occur in the head or neck area. Hemangiomas occur five times more often in females than in males.
Difference Between Vascular Malformations and Hemangiomas
Vascular malformations are present at birth and enlarge proportionately with the growth of the child. They do not involute spontaneously and may become more apparent as the child grows.
Most hemangiomas are not usually present at birth or are very faint red marks. Shortly after birth, however, they grow rapidly - often faster than the child's growth. Over time, they become smaller (involute) and lighter in color. The process of involution may take several years.
Causes of Vascular Malformations and Hemangiomas
The cause for vascular malformations and hemangiomas is usually sporadic (occurs by chance). However, they can also be inherited in a family as an autosomal dominant trait. Autosomal dominant means that one gene is necessary to express the condition, and the gene is passed from parent to child with a 50/50 risk for each pregnancy. Males and females are equally affected and there is great variability in expression of the gene. In other words, a parent may unknowingly have had a hemangioma because it faded, but the child is more severely affected. The family may not come to the attention of a geneticist until the birth of the child with a more severe condition. Other relatives with mild expression of the gene are often discovered at that time, confirming autosomal dominant inheritance.
Vascular malformations and hemangiomas are a manifestation of many different genetic syndromes that have a variety of inheritance patterns and chances for reoccurrence, depending on the specific syndrome present.
If Your Child Has a Vascular Malformation or Hemangioma
If a vascular malformation or hemangioma is very large or affects the breathing system (airway or lungs) or another large organ system, it could be life-threatening. If a hemangioma has uncontrollable bleeding, this could also be life-threatening. Large and/or life-threatening lesions should be evaluated by a multidisciplinary team of specialists that includes plastic surgeons, dermatologists, ophthalmologists, radiologists and other specialists, depending on what organs are involved.
Treatments for Vascular Malformations
Treatment for vascular malformations depends upon the type of the malformation. Each type of malformation is treated differently. Laser therapy is usually effective for capillary malformations or port wine stains, which tend to be flat, violet or red patches on the face. Arterial malformations are often treated by embolization (blood flow into malformation is blocked by injecting material near the lesion). Venous malformations are usually treated by direct injection of a sclerosing (clotting) medication which causes clotting of the channels. Most often, a combination of these various treatments is used for effective management of the lesion.
Treatments for Hemangiomas
Treatment for hemangiomas depends upon their size, location and severity. Treatment is usually not recommended for small, non-invasive hemangiomas, since they will become smaller (involute) on their own. However, hemangiomas that cause bleeding problems, feeding or breathing difficulties, growth disturbances, or impairment of vision may require medical or surgical intervention.
Treatment may include the following:
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