Dermatologic Manifestations of Lymphedema
- Author: Kathleen M Rossy, MD; Chief Editor: William D James, MD more...
Background
Lymphedema is an abnormal collection of protein-rich fluid in the interstitium due to a defect in the lymphatic drainage network. Lymphedema most commonly affects the extremities, but it can involve the face, genitalia, or trunk. Numerous causes, both primary and secondary in nature, have been identified for this condition.
The primary causes are due to abnormalities in the lymphatic system that are present at birth, although not always clinically evident until later in life. The 3 primary categories of lymphedema (due to genetic factors) are congenital lymphedema (Milroy disease), lymphedema praecox (Meige disease), and lymphedema tarda. Primary lymphedema can also be associated with various cutaneous syndromes. Sheng et al identified a VEGFR3 gene mutation in a Chinese family with Milroy disease.[1]
Secondary lymphedema is due to an acquired obstruction or infiltration of the lymphatic system. Secondary lymphedema has a number of causes, which include malignancy, infection, obesity, trauma, congestive heart failure, portal hypertension, and therapeutic intervention. Despite the fact that the underlying etiologies of secondary lymphedema vary, clinical progression is similar and difficult to control.
Filariasis is a type of lymphedema that is the result of infection with parasites and occurs most commonly in Africa.[2]
Lymphedema is a progressive, deforming condition that is both physically and psychologically debilitating.
Angiosarcoma arising in an area of long-standing lymphedema is termed Stewart-Treves syndrome. Most cases of Stewart-Treves syndrome occur in the arm after surgery for breast cancer; however, sometimes angiosarcomas can arise in a chronically lymphedematous leg.
Pathophysiology
Lymphedema is caused by a compromised lymphatic system that impedes and diminishes lymphatic return. In primary lymphedema, the failure is caused by congenital hypoplasia or aplasia of the peripheral lymphatics or by valvular incompetence. In secondary lymphedema, the lymphatic drainage is altered by an acquired blockade of the lymph nodes or by disruption of the local lymphatic channels because of (1) recurrent attacks of lymphangitis (a key type of this is cellulitis), (2) malignancy, (3) obesity, or (4) surgery. Whether the cause is acquired blockade of the lymph nodes or disruption of the local lymphatic channels, the result is a failure to drain protein-rich lymphatic fluid from the tissue, causing interstitial edema with swelling of the affected site.
Chronic lymphedema causes fissuring and impairment of the epidermis, allowing bacteria to enter and grow. With chronic lymphedema, the development of verrucous, cobblestone plaques, known as elephantiasis nostra verrucosa (ENV), can occur.
A theory has also been proposed that chronic lymphedema changes the protein composition of lymph in affected areas. A decrease in alpha-2 globulin levels and an increase in the albumin-to-globulin ratio have been reported. This change in proteins and the resultant slowing of transport to the lymphoid tissue has been suggested to play a role in diminishing the effectiveness of immune surveillance and prevents early detection of tumor-specific antigens. Additionally, repeat episodes of chronic ulceration and healing may stimulate the proliferation of keratinocytes, which may contribute to neoplastic transformation.
Epidemiology
Frequency
United States
A common cause of lymphedema reported in the United States is surgical therapeutic intervention (postsurgical complication), most commonly following mastectomy with axillary dissection and radiation therapy for breast cancer. Although not reported as often as postmastectomy induced–lymphedema, obesity is one of the most common causes of lymphedema seen in practice today.
Among the primary causes of lymphedema, lymphedema praecox is the most commonly reported.
International
Worldwide, the most common cause of lymphedema is filariasis infection. More than 100 million people are affected in endemic areas worldwide.[3]
Mortality/Morbidity
The outcome for persons with lymphedema depends on its chronicity, the complications that result, and the underlying disease state that caused the lymphedema.
The development of angiosarcoma (ie, Stewart-Treves syndrome) in the setting of lymphedema is the most serious complication of secondary lymphedema. The mean survival rate, after treatment, is approximately 24 months. The 5-year survival rate is 10%.
Other complications that increase morbidity are the development of recurrent cellulitis, bacterial or fungal infections, and lymphangioadenitis.
Sex
Primary lymphedema is most common in females. Lymphedema praecox is the most common form and affects 1 in 100,000 girls and 1 in 400,000 boys.
Age
Secondary lymphedema can affect persons of any age group, and its onset is determined by the primary cause. Hereditary (primary) lymphedema can be divided into 3 groups based on the age of onset of clinical lymphedema, as follows:
- Milroy disease is the familial form of lymphedema that usually manifests from birth to age 1 year.
- Lymphedema praecox (ie, Meige disease) occurs from age 1-35 years. It most commonly occurs around menarche.
- Lymphedema tarda manifests after age 35 years.
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