The causes differ depending on the type of angioma.
Cutaneous hemangiomas are completely benign tumors that appear within 15 days of birth. They develop from the cells of the walls of the cutaneous capillaries.
Planar angiomas, otherwise known as "wine-colored" spots, are malformations of the subcutaneous capillaries. They do not disappear contrary to the haemangiomas previously described. But can fade with time. Cutaneous planar angiomas are benign and do not become complicated.
Finally, when the angiomas are multiple, or they reach the deep organs, a congenital disease can be involved. Different syndromes have been described, explaining the causes of these angiomas ...
Among others: Klippel-Trenaunay syndrome. It associates cutaneous angiomas of the lower limb with vascular malformations of the skin and underlying bones responsible for hypertrophy of this limb.
Sturge-Weber-Krabbe syndrome should be investigated in front of an angioma in the upper part of the face. Other manifestations that complete this syndrome are an angioma of the pia mater (vascularized membrane that surrounds the nervous system), early convulsions, psychomotor retardation and congenital glaucoma.
Rendu Osler's disease involves small angiomas of the lips, tongue, and digital extremities. And associated with frequent nosebleeds, and possible liver damage. It is a familial condition of genetic cause with autosomal dominant inheritance. It is revealed in the second childhood and its manifestations are accentuated with age.
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