Chromoblastomycosis

Image:Chromoblastomycosis.gif Chromoblastomycosis is a long-term fungal infection of the skin and subcutaneoustissue (a chronicsubcutaneous mycosis). The infection occurs most commonly in tropical or subtropical climates, often in rural areas. It can be caused by many different type of fungiwhich become implanted under the skin, often by thorns or splinters. Chromoblastomycosis spreads very slowly; it is rarely fatal and usually has a good prognosis, but it can be very difficult to cure. There are several treatment options, including medication and surgery.

Features

The initial trauma causing the infection is often not noticed or forgotten. The infection builds at the site over a period of years, and a small red papule(skin elevation) appears. The lesion is usually not painful and there are few, if any symptoms. Patients rarely seek medical care at this point.

Several complications may occur. Usually, the infection slowly spreads to the surrounding tissue while still remaining localized to the area around the original wound. However, sometimes the fungi may spread through the blood vesselsor lymph vessels, producing metastaticlesions at distant sites. Another possibility is secondary infection with bacteria. This may lead to lymph stasis(obstruction of the lymph vessels) and elephantiasis. The nodules may become ulcerated, or multiple nodules may grow and coalesce, affecting a large area of a limb.

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Diagnosis

The most informative test is to scrape the lesion and add potassium hydroxide(KOH), then examine under a microscope. (KOH scrapings are commonly used to examine fungal infections.) The pathognomonicfinding is observing Medlar bodies, sclerotic cells. Scrapings from the lesion can also be culturedto identify the organism involved. Blood tests and imaging studies are not commonly used.

Pathophysiology

Chromoblastomycosis is believed to originate in minor trauma to the skin, usually from vegetative material such as thorns or splinters; this trauma implants fungi in the subcutaneous tissue. In many cases the patient will not notice or remember the initial trauma, as symptoms often do not appear for years. The fungi most commonly observed to cause chromoblastomycosis are Fonsecaeapedrosoi, Phialophoraverrucosa, Cladosporiumcarrionii, and Fonsecaea compacta.

Over months to years, an erythematous papule appears at the site of inoculation. Although the mycosis slowly spreads, it usually remains localized to the skin and subcutaneous tissue. Hematogenous and/or lymphatic spread may occur. Multiple nodules may appear on the same limb, sometimes coalescing into a large plaque. Secondary bacterial infection may occur, sometimes inducing lymphatic obstruction. The central portion of the lesion may heal, producing a scar, or it may ulcerate.

Treatment

Chromoblastomycosis is very difficult to cure. There are two primary treatments of choice. Itraconazole, an antifungalazole, is given orally, with or without flucytosine(5-FC). Alternatively, cryosurgerywith liquid nitrogenhas also been shown to be effective. Other treatment options are the antifungal drug terbinafine, an experimental drug posaconazole, and heat therapy. Antibioticsmay be used to treat bacterial superinfections.

Prognosis

The prognosis for chromoblastomycosis is very good for small lesions. Severe cases are difficult to cure, although the prognosis is still quite good. The primary complications are ulceration, lymphedema, and secondary bacterial infection. There have been a few cases reported of malignanttransformation to squamous cell carcinoma. Chromoblastomycosis is very rarely fatal.

Prevention

There is no known preventative measure aside from avoiding the traumatic inoculation of fungi. At least one study found a correlation between walking barefoot in endemicareas and occurrence of chromoblastomycosis on the foot.

Epidemiology

Chromoblastomycosis occurs around the world, but is most common in rural areas between approximately 30° N and 30° S latitude. Madagascarand Japanhave the highest incidence. Over two thirds of patients are male, and usually between the ages of thirty and fifty. A correlation with HLA-A29 suggests that genetic factors may play a role as well.

References

• Bennet, John E. (2001). Miscellaneous Mycoses and Algal Infections. In Eugene Braunwald, Anthony S. Fauci, Dennis L. Kasper, Stephen L. Hauser, Dan L. Longo, & J. Larry Jameson (Eds.), Harrison's Principles of Internal Medicine (15th Edition), p. 1180. New York: McGraw-Hill

• Castro, Luiz Guilherme M.; Scwartz, Robert A.; & Baran, Eugenusz (May 20, 2003). "Chromoblastomycosis." eMedicine.

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It uses material from the http://en.wikipedia.org/wiki/Chromoblastomycosis Wikipedia article Chromoblastomycosis.