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Types of Vascular Anomalies: Venous Malformation

Venous malformations occur when veins do not properly form. As a result of this anomalous development, venous malformations may include vessels that are irregular or enlarged, and may lack the valves that prevent backflow in normal venous structures. Sometimes these anomalies appear as small, bluish lesions in the skin. In other patients, they may also involve larger abnormal vessels, which can pose a risk for blood clots. Venous malformations may involve any body area, and may be limited to the skin or arise in deeper tissues. They may also be found in conjunction with lymphatic malformations in some patients (mixed vascular malformations).

Although the exact cause of most venous malformations is unknown, physician-scientists have found that improper assembly of the smooth muscle cells normally forming the outer layer of veins can result in venous malformations in some cases. In other instances, venous malformations may be associated with other vascular anomalies, such as glomuvenous malformations or blue rubber bleb nevus syndrome.

Signs and Symptoms

Venous malformations typically are present at birth. Because they often get larger over time (as a child grows), a patient may not notice them or have any symptoms until childhood or adolescence. Venous malformations appear as bluish-purple marks that feel soft to the touch. When compressed, blood empties from the area and the malformation may look smaller or lighter in color. Symptoms vary based on the size and location of the malformation(s) and may include pain and/or swelling.

Diagnosis

Physicians can usually diagnose venous malformations based on a patient's medical history and a physical examination. In addition, imaging studies may provide more information about the extent of the lesion(s).

Treatment

Treatment for venous malformations depends on the size and location of the lesion(s). Smaller malformations that occur on the skin's surface and do not cause pain may only require observation. Treatment for symptomatic, larger or more extensive lesions may include:

  • Compression garments to reduce swelling
  • Surgical removal (excision) of the malformation
  • Sclerotherapy, the injection of a solution directly in the vein, which causes it to collapse

The vascular anomalies team will recommend the best treatment option for your child's venous malformation.

About Our Program

The Vascular Anomalies Program at Comer Children’s offers an integrated and comprehensive approach to the diagnosis, care and management of hemangiomas and vascular malformations. Our multidisciplinary team of pediatrics experts works together to educate families and to evaluate and treat children with all types of these vascular lesions. » Read more about our program and our team.