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"Lipedema," a special form of obesity syndrome, represents swelling of the legs due to an increase of subcutaneous adipose tissue. In 12 patients with lipedema of the legs and in 12 healthy subjects (controls), fluorescence microlymphography was performed to visualize the lymphatic capillary network at the dorsum of the foot, at the medial ankle, and at the thigh. Microaneurysm of a lymphatic capillary was defined as a segment exceeding at least twice the minimal individual diameter of the lymphatic vessel. In patients with lipedema, the propagation of the fluorescent dye into the superficial lymphatic network of the skin was not different from the control group (p > 0.05). In all 8 patients with lipedema of the thigh, microaneurysms were found at this site (7.9 +/- 4.7 aneurysms per depicted network) and in 10 of the 11 patients with excessive fat involvement of the lower leg, multiple microlymphatic aneurysms were found at the ankle region. Two obese patients showed lymphatic microaneurysms in the unaffected thigh and in only 4 patients were microaneurysms found at the foot. None of the healthy controls exhibited microlymphatic aneurysms at the foot and ankle, but in one control subject a single microaneurysm was detected in the thigh. Multiple microlymphatic aneurysms of lymphatic capillaries are a consistent finding in the affected skin regions of patients with lipedema. Its significance remains to be elucidated although its occurrence appears to be unique to these patients.
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Venous oedema, which occurs almost exclusively in the legs, develops due to increased venous pressure following valvular insufficiency, and is marked by blue discolouration, varicosities and, in chronic forms, by brown discolouration of the skin resulting from the deposition of haemosiderin. It is possible to confirm the condition by phlebological instrumental diagnosis. Primary lymphoedema also almost always occurs in the legs. It is caused by underdevelopment of lymphatic vessels, but the skin colour remains normal. It is recognisable by Stemmer’s sign and characteristic thickening of the skin over the toes resulting from subcutaneous protein fibrosis. Lymphoscintigraphy may be required for diagnosis in rare cases. Venous oedema and lymphoedema are found in both sexes, uni- or bilaterally. If bilaterally then usually asymmetrical. In contrast, lipoedema occurs in women only, thickening is always symmetrical, and the skin has a normal colour as in lymphoedema. The predisposing condition for lipoedema is lipohypertrophy of the extremities, a congenital accumulation of adipose tissue in the extremities that results in a disproportionate physical form with a relatively slim trunk. In one third of cases lipoedema is also observed in the arms. In contrast to lymphoedema, the hands and feet characteristically remain free of thickening and oedema.
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Diagnosis and treatment of the <<Lipedema Syndrome>> are now as ever connected with problems for the general physcician, but also for the experts in lymphology. Numerous open questions regarding etiology, diagnosis, and course of the disease as new therapetic concepts have lead to the idea, to include that subject again as one of the main topics into the program of the annual meeting of the German Society of Lymphology
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