Klippel-Trenaunay Syndrome is a rare congenital medical condition in which blood vessels and/or lymph vessels fail to form properly and there is abnormal growth of soft and bone tissue.
This vascular disorder involves Capillary, Lymphatic and Venous abnormalities and using these initials some authors use the acronym CLVM to describe the malformations caused by the disease. Others use KTS as a general umbrella term for diseases connected to CV malformations (CVM) or just capillary stain (CM).
Primitive cells that were supposed to become veins, arteries or lymphatic vessels, bone or fat form a limb instead. This mutation is sporadic, meaning that there is no proven inheritance pattern and this is due to the fact that the mutation does not concern germ cells, and therefore, remains somatic.
Typical symptoms of KTS include capillary stains (sometimes referred to as ‘hemangiomas’) which are abnormal benign growths on the skin consisting of masses of blood vessels and varicose veins, port-wine stains with sharp borders, an improperly developed lymph system, fused toes or fingernails, extra toes or fingernails, and hypertrophy of bony and soft tissues that can lead to shrinking in the lower body and legs.
In certain cases internal bleeding may occur due to blood vessel malformations involving organs such as the vagina, stomach, rectum, liver spleen, bladder, heart, kidneys, or lungs. These individuals are also at risk for developing blood clots. The cause of the mutation that leads to Klippel-Trenaunay syndrome is unknown.
The condition is complex and therefore there is no one form of treatment that applies to all cases. Sclerotherapy involves the injection of a chemical into the affected veins to cause thickening and obstruction of the targeted vessels to allow normal blood flow to continue. Laser surgery is used to diminish or erase some skin lesions.
Compression garments are recommended for older children and adults to alleviate pain, inflammation, and swelling in the affected area. When compression therapy is combined with elevation the patient can lead a comfortable life without the need for surgery.