K-T syndrome, also known as “vascular bone hypertrophy syndrome” has three main features: (1) nevus-like capillary dilation malformation; (2) varicose veins; and (3) soft tissue and bone tissue hyperplasia. Some of the manifestations of K-T syndrome, such as wine stains, can be found in infancy and are often thought to be birthmarks, and only when the lesion worsens and one of the limbs grows and thickens will the patient be seen. It is mainly manifested in the extremities, especially in the lower extremities, and some lesions involve the buttocks, waist, lower abdomen or shoulders, usually involving one limb. The main manifestations are (1) superficial varicose veins of the lower limbs, the occurrence of which is different from the general superficial varicose veins of the lower limbs, mainly concentrated in the outer part of the thighs or buttocks, and the veins are usually not obviously elevated; (2) wine-colored spots, a kind of slightly elevated light red or purple-red nevus in the shape of a map, which can fade when pressed, is actually an intradermal vascular nevus, which is the characteristic manifestation of the disease and is often mistaken as a birthmark by parents. ③The growth or thickening of one limb, as the child grows, the limb on the affected side will gradually grow and thicken. ④Increased skin temperature of the affected limb. By comparing the temperature of the limbs on both sides, it can be found that the temperature of the affected limb is slightly higher. You can touch the limb with the back of your hand and feel the slight difference in skin temperature. 2. Lymphedema: Lymphatic edema is caused by the abnormal development of lymphatic vessels, which leads to the obstruction of lymphatic fluid return, mostly starting from the distal end of the limb, and the exudation of lymphatic fluid leads to the thickening and hardening of subcutaneous tissue, and the pressure on the skin feels hard. There is no special treatment method, but mainly symptomatic reduction treatment. If the limb length difference exceeds 1.5cm, the heel of the healthy side can be padded to prevent secondary lesions caused by long-term limping. For the thickening of the affected limb, medical elastic stockings or elastic bandages should be used for compression therapy, which can control varicose veins, reduce the heaviness and swelling of the lower limbs caused by venous stasis, and prevent the occurrence of thrombotic superficial phlebitis. The price of imported medical elastic stockings for treatment is about 300~500 RMB. For superficial varicose vein with open deep vein and normal venous valve function, local varicose superficial vein stripping or laser treatment can be performed. Sclerotherapy has gradually become the first choice of superficial vein treatment for such patients, and our vascular surgery department has applied foam sclerotherapy to treat many patients with varicose veins and vascular malformation with very satisfactory results. In patients with deep venous defects, this method is not applicable. In children with arteriovenous fistula (in fact, patients with arteriovenous fistula are P-W syndrome) or bilateral limbs of unequal length, arteriography of bilateral lower limbs can be performed first, and if abnormal vessels are found, they can be embolized or surgically ligated in order to retard the development of the affected limbs and reduce claudication. For children with cavernous hemangioma, hemangioma removal or sclerotherapy is feasible.