Capillary malformation
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Capillary malformation (English: capillary malformation) is a congenital developmental defect of blood vessels belonging to the group of vascular malformations. It involves abnormal structure and dilation of small capillary vessels (capillaries) located in the dermis. These lesions are present from birth and, unlike hemangiomas, are not neoplastic in nature nor do they exhibit a phase of spontaneous regression. They most commonly appear as red, pink, or purple patches on the skin, which may gradually darken and thicken with age. Capillary malformations most often occur on the face, neck, and limbs, and their extent and severity are highly variable.
Capillary malformation – what is it?
Capillary malformation constitutes a congenital developmental abnormality of the vascular system, arising during embryogenesis, that is during the period of blood vessel formation in fetal life. As a result of abnormal differentiation of endothelial cells there is permanent dilatation of superficial capillary vessels in the dermis.
These lesions are classified among so-called low-flow vascular malformations (low-flow vascular malformations). Unlike infantile hemangiomas:
- they do not proliferate (do not undergo intense proliferation after birth)
- they do not undergo a phase of spontaneous regression
- they persist throughout the patient’s life
Capillary malformations may occur as isolated lesions or be part of more complex vascular syndromes. The most important include:
- Sturge–Weber syndrome – a capillary malformation of the face with accompanying vascular changes in the brain,
- Klippel–Trénaunay syndrome – a combination of capillary malformation with soft tissue overgrowth and venous abnormalities,
- Parkes Weber syndrome – vascular malformations with the presence of arteriovenous fistulas.
In recent years it has been shown that in many patients the lesions are caused by somatic mutations in the GNAQ gene, leading to disturbances of cellular signaling in the vascular endothelium.
Capillary malformation – what it looks like
The most characteristic sign of a capillary malformation is a flat, well-demarcated vascular patch with a color ranging from light pink to dark red or purple. In the medical literature these lesions are often referred to as "port-wine stain" (port-wine stains).
Typical clinical features include:
- presence of the lesion from birth,
- absence of elevation in the neonatal period,
- slow enlargement as the child grows,
- no spontaneous regression.
With age the lesions may progress. The skin undergoes gradual dilation of vessels and tissue remodeling, which leads to:
- thickening of the skin,
- formation of vascular nodules,
- darkening of the lesion's color.
The most common locations of capillary malformations include:
- the face (particularly the cheeks and forehead),
- the neck,
- the upper and lower limbs,
- the trunk.
The clinical significance of the location is diagnostically important. For example, capillary malformations located in the distribution of the first branch of the trigeminal nerve (the forehead and eye area) may suggest an increased risk of Sturge-Weber syndrome.
In the differential diagnosis, other vascular skin lesions should be considered, such as:
- infantile hemangiomas,
- telangiectasias,
- rosacea,
- cavernous hemangiomas.
Capillary malformation – treatment
Capillary malformations do not resolve spontaneously, so in many cases treatment aimed at reducing the visibility of the lesions and improving the skin's appearance is considered. Therapy depends on the size of the lesion, its location and the patient's age.
The most effective treatment method currently is vascular laser therapy, which selectively targets the hemoglobin located in the dilated blood vessels. The laser light energy causes photothermolysis of the vessels, i.e. their controlled closure without damaging the surrounding tissues.
The most commonly used technologies include:
- pulsed dye laser (PDL – Pulsed Dye Laser)
- Nd:YAG laser
- KTP laser
Treatment usually requires a series of procedures performed at intervals of several weeks, because a single procedure does not allow complete removal of all dilated vessels.
The effects of treatment include:
- lightening of the vascular lesion,
- reduced visibility of the lesion,
- improvement of skin texture.
In some cases, particularly for extensive or thickened lesions, treatment may be supplemented with other dermatological or surgical procedures.
In aesthetic medicine and dermatology practice, various methods are used to treat vascular skin lesions, including:
- laser closure of vessels,
- laser therapy for vascular lesions,
- high-energy light therapy,
- dermatological procedures that improve skin texture.
Early initiation of treatment – especially in childhood – increases the chances of achieving better therapeutic results and reduces the risk of lesion thickening in later life.
