Elephantiasis (Elephantiasis tropica): Causes, Lymphatic Stasis, and Treatment of Lymphatic Filariasis with Extreme Enlargement of a Body Part

Elephantiasis, also known as elephant disease, is a striking condition. It occurs more frequently in developing countries than in industrialized nations. A buildup of lymph fluid—which can be either congenital or acquired—causes various parts of the body to swell excessively. The legs and male genitalia are particularly commonly affected.

A distinction is made between congenital and acquired forms of elephantiasis. The congenital form is very rare, while the acquired form can be caused by pathogens or conditions typical of developed countries (obesity, diabetes mellitus, venous thrombosis).

These conditions can destroy or block the lymphatic vessels, thereby preventing the proper drainage of lymph fluid. This leads to what is known as lymphatic swelling, also called lymphedema.

When should one consider the possibility of a congenital form of elephantiasis?

The congenital form appears as early as infancy, with severe swelling of the arms or legs. In this case, the lymphatic vessels are not properly formed. Other congenital causes include comprehensive malformation syndromes such as neurofibromatosis. In these cases, the vascular system is affected, as are other tissues such as the brain or the skin.

What causes acquired forms of elephantiasis in developed countries?

In acquired forms, progressive destruction of the lymphatic vessels is a key factor; this can result, for example, from chronic inflammation of the leg veins or the skin of the lower legs (erysipelas). An increased tendency toward blood clotting, a history of leg vein thrombosis, or diabetes mellitus can be contributing factors.

The characteristic clinical presentation is swelling of the leg, also known as lymphedema. In the early stages, the lymphedema may resolve; however, as the condition progresses, the swelling may become permanent. The final stage of lymphedema, when it is at its most severe, is referred to by medical professionals as elephantiasis. In this stage, the swelling is massive and irreversible (medically irreversible).

What causes elephantiasis in developing countries?

Among the acquired forms, there is also a tropical disease that occurs primarily in developing countries. Pathogens are responsible for this—specifically, infection with filarial worms (filariae). These are transmitted by mosquitoes; the disease is also known among medical professionals as “lymphatic filariasis” (lymphatic = relating to the lymphatic system; filariasis = infection with filariae).

Through insect bites, the worms or bacteria enter the human body, where they penetrate the lymphatic system. This triggers various inflammatory reactions that cause lymphatic fluid to back up. Herpes viruses can also block or completely destroy the lymphatic vessels when the immune system is weakened.

The worms’ eggs are also transmitted from person to person by mosquitoes. 

Can I contract elephantiasis while traveling in the tropics?

Yes, it is generally possible to contract elephantiasis tropica while traveling to the tropics if you visit regions where the disease is endemic. Infection occurs through the bite of an infected mosquito that transmits filarial worms (filariae) such as Wuchereria bancrofti or Brugia malayi. These parasites enter the lymphatic system via the bloodstream, where they cause chronic inflammation and lymphatic congestion. Tropical regions in Africa, Southeast Asia, and South America are particularly affected. To prevent infection, travelers should consistently protect themselves from mosquito bites—for example, by wearing long, light-colored clothing, using insect repellent, and sleeping under mosquito nets. There is currently no vaccine against elephantiasis, so mosquito prevention is the most important form of protection.

Elephantiasis is usually diagnosed based solely on the findings of a physical examination. The swelling in the affected areas of the body is usually very pronounced. Diagnosing congenital elephantiasis is also generally straightforward, as the disease typically manifests in infancy or childhood.

However, to determine the cause of acquired elephantiasis, further tests must be conducted. Here, too, the medical history is of primary importance. For example, a history of deep vein thrombosis in the legs or leg infections is important and is always inquired about, as is travel to tropical countries.

Instrumental examinations—that is, diagnostic tests using medical devices—include, among others,

• blood flow measurements,
• an ultrasound examination,
• magnetic resonance imaging (MRI) if necessary, and
• tissue samples

. To diagnose infections more accurately, bacterial swabs must also be taken.

Elephantiasis is a chronic condition that is not easy to cure. Elephantiasis is contagious only in the tropics; it is not contagious in our latitudes. Nevertheless, it is important to treat accompanying soft-tissue infections that can result from the chronic swelling. These include, among other things, moist compresses with antiseptic solutions and the administration of antibiotics. In severe cases, it may also be necessary to administer antibiotic therapy and treat the infection in a hospital setting.

Other measures include manual lymphatic drainage and compression therapy to reduce swelling. Lymphatic drainage involves, so to speak, massaging the tissue to stimulate the drainage of lymph fluid. However, caution is advised with larger wounds; the priority here is first and foremost to allow the wound to heal. Finally, compression bandages or compression stockings and tights can help alleviate symptoms and reduce swelling.

If the wounds do not heal on their own or are very deep or heavily infected, they should be surgically debrided. If necessary, a plastic surgeon can tighten the skin along with the subcutaneous tissue, but cannot fully restore it to its pre-disease condition.

In extreme cases, if there is a risk of sepsis or the condition continues to deteriorate, amputation of the affected limb may be necessary. Fortunately, however, this is extremely rare.

Are there also surgeries in which the lymphatic vessels can be reconstructed?

It is also possible to replace or bypass lymphatic vessels. However, since lymphatic vessels are not visible to the naked eye, these are so-called microsurgical procedures that must generally be performed using loupes or a microscope. They are technically very demanding, and the patency rates of these so-called lymphatic vessel grafts are very low.

Only a few clinics in Germany offer this surgery; it is usually performed by plastic surgeons at university medical centers. You may therefore have to expect a longer travel distance. In addition, every surgery carries risks, so the pros and cons must be carefully weighed in this case.

As with many chronic conditions, early diagnosis is the best protection against developing a severe form of elephantiasis that doctors can no longer treat. See a doctor at the first signs of lymphatic congestion. This is especially important if you have recently been in the tropics or have an underlying condition that can damage the lymphatic system.

What are the characteristic symptoms of elephantiasis?
Elephantiasis is an advanced stage of a lymphatic disorder in which a chronic inflammatory reaction leading to lymphatic congestion causes extreme enlargement of individual body parts. The legs or external genitalia are particularly affected; the arms, testicles, or genital area are affected less frequently. The inflammatory destruction of the lymphatic drainage pathways and lymphatic vessels results in permanent lymphedema, which, medically speaking, is usually no longer fully reversible.

How does tropical elephantiasis develop in the body?
Tropical elephantiasis, also known as lymphatic filariasis, is transmitted by the bite of an infected mosquito. During the bite, tiny larvae of the filarial worms Wuchereria bancrofti or Brugia malayi enter the lymphatic system via the bloodstream. There, the parasites settle in the lymph nodes, causing an inflammatory reaction and blocking the flow of lymph. Over time, this chronic inflammation leads to severe swelling and deformation of the affected body parts.

Can leprosy also cause elephantiasis?
Yes, in rare cases, leprosy can trigger symptoms similar to those of elephantiasis. Chronic infection with the pathogen Mycobacterium leprae can cause permanent damage to the skin, the lymphatic system, and the nerves. This can also lead to lymphatic congestion with thickening and swelling of specific body regions, similar to what is known as “Elephant Man syndrome.”

Is elephantiasis curable or only treatable?
Elephantiasis is considered a chronic disease, but it is partially treatable in its early stages. A complete cure is rare, as the inflammatory processes and damage to the lymphatic system are usually advanced by the time the disease is diagnosed. Medications such as ivermectin or diethylcarbamazine are considered the treatments of choice for killing the filarial worms and preventing the disease from progressing. Lymphatic drainage and compression therapy also help alleviate symptoms and prevent complications.

What helps with advanced-stage elephantiasis?
In advanced cases, treatment focuses on reducing swelling and halting the progression of the disease. This includes regular lymphatic drainage, consistent skin care to prevent ulcers and inflammatory infections, and compression therapy to support lymphatic drainage. In severe cases, surgical intervention may be necessary to remove damaged tissue or to surgically improve lymphatic flow.

What complications can occur with untreated elephantiasis?
If elephantiasis remains untreated, it can lead to recurrent inflammation, ulcers, and bacterial infections. Secondary conditions such as erysipelas, a complication of the globally prevalent condition erysipelas, also occur frequently. The skin becomes increasingly hardened and thickened, which can severely limit mobility. Early diagnosis and treatment are therefore crucial to preventing complications and improving the quality of life for those affected.