Jason J. Emer, MD, Mount Sinai School of Medicine, Department of Dermatology, New York, New York
Joel B. Spear, MD, Resurrection Health Care System at Saint Joseph Hospital, Chicago, Illinois
Blastomycosis is a fungal infection caused by Blastomyces dermatitidis. Exposure in endemic regions frequently occurs when spores in soil are disturbed and subsequently inhaled. Less commonly, primary cutaneous blastomycosis may follow after traumatic inoculation of the fungus into the skin. Most patients infected with blastomycosis are asymptomatic, but an unfortunate small number present with fulminant disease. Rarely, the infection can affect organs, such as the skin, bone, or genitourinary system. In a small percentage of cases, blastomycosis may cause acute respiratory distress syndrome, which is associated with a very high mortality rate. Increased survival rates have been shown when the clinician has a high index of suspicion and facilitates rapid evaluation and initiation of the appropriate therapy. We present a rare case of a patient presenting with primary cutaneous blastomycosis that progressed to disseminated disease causing acute respiratory distress syndrome. High clinical suspicion, prompt diagnostic testing, and therapy with amphotericin B, confirmed the diagnosis and resulted in a swift recovery.
(J Clin Aesthetic Dermatol. 2009;2(3):22–30)
Blastomycosis is an infection caused by the fungus Blastomyces dermatitidis, which is endemic to areas of the United States and Canada including the Great Lakes Region and the Mississippi and Ohio River Valleys.[1,2] Exposure occurs in moist wooded areas during outdoor activities when fungal microhabitats existing in soil are disturbed. Inhaled conidia can result in a primary lung infection, which may then become disseminated.[3,4] Pulmonary disease is the most common manifestation of blastomycosis with isolated lung disease occurring in 60 to 75 percent of infected people. In the remaining group, dissemination to skin, bone, genitourinary, and other organ systems can be seen. In fewer than 10 percent of cases, blastomycosis can progress to acute respiratory distress syndrome (ARDS) with dyspnea, tachypnea, and hypoxemia as systemic manifestations.[6–12]
Palmer and McFadden reported the first case of disseminated blastomycosis causing ARDS in 1968. Since then, few studies have identified disseminated blastomycosis as a cause of ARDS (Table 1). Our review of these reports revealed that out of 33 patients with ARDS secondary to blastomycosis, 21 deaths resulted. Although the exact mechanism is not fully known, systemic stimulation of inflammatory mediators gives a reasonable explanation for the high mortality rate of 40 to 60 percent described in the literature for all causes of ARDS. Thus, early suspicion of disseminated disease is especially helpful in endemic areas since rapid institution of therapy can improve morbidity and mortality.
Blastomycosis may seldom present as a primary cutaneous lesion after traumatic inoculation from laboratory or autopsy exposure, animal bites or scratches, and outdoor trauma.[15,16] A total of 22 cases of cutaneous inoculation blastomycosis were compiled for a major article, reviewing literature from 1903 to 2002. The clinical presentation of infected patients is variable and symptoms of infection may be absent, chronic, acute, or even fulminant. Primary cutaneous blastomycosis is often mistaken for other cutaneous entities such as keratoacanthoma, squamous cell carcinoma, tuberculosis, tertiary syphilis, leprosy, or bacterial pyoderma.
We describe a rare case of a patient with an unhealed cutaneous lesion who underwent surgical debridement and postoperatively developed life-threatening disseminated blastomycosis progressing to ARDS. With a high index of clinical suspicion, rapid diagnosis, and prompt therapy with amphotericin B (AmB), the patient recovered.
A 49-year-old man with a past medical history of type 2 diabetes mellitus (T2DM) and hypertension presented with a history of right knee pain and swelling. The patient had sustained a small bruise on his right knee following minor trauma eight months previously. The bruise resolved spontaneously; however, approximately three months prior to presentation, he noted onset of pain and swelling over the right knee. The pain and swelling were associated with intermittent bloody and purulent discharge from a cutaneous lesion that had developed. Over the next three months, he had multiple right knee fluid aspirations with fluid analysis that showed no crystals, minimal white blood cells, and no growth on bacterial culture. No mycobacterial or deep fungal cultures of either the aspirated fluid or wound discharge were requested. As an outpatient, he had been treated empirically for gouty arthritis and had two courses of oral antibiotics. The patient’s review of systems was significant only for subjective fevers. He denied chills, shortness of breath, cough, or hemoptysis.
On initial presentation, the patient’s temperature was 100.2°F, heart rate 102 beats per minute (bpm), respiratory rate 14, blood pressure 160/70mmHg, and oxygen saturation 97 percent on room air. The chest auscultatory findings were normal bilaterally. The most pertinent physical examination finding was a dark purple-black eschar over the anterior surface of the right knee, with punctate hemorrhage and purulent drainage (Figure 1). The right knee was exquisitely tender to light palpation, and he experienced severe pain on passive range of motion. Bacterial wound and blood cultures were taken before intravenous (IV) vancomycin and ceftriaxone were started. The wound was then debrided in the operating room. Three days after debridement, the patient was noted to be acutely short of breath with a respiratory rate of 24, febrile with a temperature of 103.3°F, and hypoxemic with an oxygen saturation of 80 percent on room air.
A chest radiograph revealed diffuse bilateral pulmonary infiltrates (Figure 2). Computed tomography of the chest showed no evidence of pulmonary embolism (Figure 3). A transthoracic echocardiogram revealed no valvular pathology and ejection fraction was 75 percent. Because of high suspicion for blastomycosis, another specimen obtained from the knee was stained with methamine silver, which subsequently revealed broad-based budding yeast (Figures 4a–4c). The patient began AmB at a dose of 1mg/kg/day. The patient required supplemental oxygen by face mask, but not ventilatory support. The patient’s hospital course was complicated by acute renal insufficiency attributed to the AmB therapy. Liposomal AmB was substituted with subsequent stabilization of renal function. Clinical improvement was gradually seen and the patient was discharged on the 17th day of hospitalization with a six-month course of itraconazole therapy (200mg orally twice daily). The patient continued close follow up with the infectious disease service as an outpatient for a duration of nine months and is currently fully recovered.
B. dermatitidis is a fungal pathogen that can affect any mammalian host. It is a common pulmonary and cutaneous mycosis encountered in people living in southeastern states near the Mississippi and Ohio River basins and the Midwestern states and Canadian provinces bordering the Great Lakes.[1,2] Infection with B. dermatitidis is known as Gilchrist’s disease, named after the Johns Hopkins pathologist who was first to describe the disease in 1894. The disease has also been called Chicago’s disease because of early case reports from that area.
In 1951, Schwarz and Baum emphasized that the portal of entry in humans is the respiratory tract rather than the skin, as was previously believed. It was discovered that infection occurred by inhalation of aerosolized conidial forms of the organism, which grow in warm, moist soils of wooded areas rich in organic debris.[4,20] After inhalation, the conidia transform to yeast which, with a thick cell wall, confer resistance to phagocytosis allowing for rapid growth, noncaseating granuloma formation, and progression to an intense inflammatory reaction allowing for dissemination. Extrapulmonary sites of blastomycosis include skin (20–40%), bone (10–25%), prostate and genitourinary organs (5–15%), and the central nervous system (5%).[3, 21–29]
Since this landmark discovery, it has been widely accepted that most cases of cutaneous blastomycosis occur after hematogenous spread from a primary pulmonary infection, even in the absence of overt pulmonary disease. Most cases of secondary cutaneous infection have no associated pulmonary findings on chest radiograph.[31–33] Primary cutaneous blastomycosis may result as a traumatic inoculation event, but systemic spread from cutaneous lesions rarely occurs.
There is no established common link among patients developing blastomycosis infection with respect to underlying disease, immunosuppression, age, sex, occupation, or other factors. However, in multiple epidemiological studies, the majority of patients with blastomycosis were men who were immunocompetent. The male prevalence likely reflects occupational exposure in agricultural work and manual labor in endemic areas.[15,23,36] Many reports have been published of patients who lived in endemic areas and often participated in activities in the wooded outdoors. Numerous cases in the literature draw attention to blastomycosis infection in hunters and their hunting dogs simultaneously.[37–39]
The varied clinical presentation of blastomycosis ranges from a subclinical asymptomatic infection or a more severe disseminated infection presenting with acute respiratory failure. A fulminant course may present in both immunocompetent and immunocompromised hosts. Skin lesions are the most common presenting feature of extrapulmonary blastomycosis, but may present after cutaneous trauma, transmitting the fungus into the skin. In a patient with cutaneous disease and no evidence of pulmonary disease, current concepts presume an underlying pulmonary infection or one that may have resolved spontaneously. Cellular immunity is considered to be the major protective factor in preventing progressive disease. Unlike other fungi causing systemic mycosis, B. dermatitidis has been reported as significant in only a small number of patients who are immunocompromised, such as those with HIV infection.[42,43]
Skin manifestations of blastomycosis are often very striking, thus the initial cases were reported as primarily dermatologic.[2,3] Lesions are more common on the face, neck, and extremities and begin as papules, pustules, or subcutaneous nodules. Typical lesions are verrucous plaques or cutaneous ulcers, frequently with a distinctive purple-blue halo that may suppurate and spontaneously drain, forming deep cutaneous ulcers. The lesions can easily be mistaken for pyoderma gangrenosum, squamous cell carcinoma, and other chronic cutaneous infections, such as sporotrichosis, nocardiosis, atypical mycobacteriosis, tularemia, anthrax, or leishmaniasis.[22–24]
Although cutaneous blastomycosis is most often secondary to dissemination, self-inoculation has been documented. In an article by Wilson et al, four cases were documented—three by accidental cutaneous puncture wounds while performing autopsies and one in a pathologist who worked with fungi and inadvertently noted an indolent abscess on his left wrist that, after evacuation, persisted as a papule with a central crater. B. dermatitidis was demonstrated by microscopic examination of pus taken from the primary lesion and was later recovered in culture. All cases were treated with local wound care and none resulted in disseminated disease.[16,44]
Gray and Baddour summarized published cases of inoculation and established that the physical examination of lesions cannot differentiate primary cutaneous inoculation from disseminated lesions. Lesions were non-specific and variably described as: verrucous, nodular, papular, and chancreform. Alternatively, Rutland and Horenstein suggested that inoculation blastomycosis is often associated with painful lympadenopathy, induration and chancre formation, and spontaneous resolution—clinical features that can help to differentiate primary inoculation from an asymptomatic dissemination.
Pulmonary blastomycosis is less commonly recognized than the cutaneous form. Patients can present with an acute or chronic pneumonia with fever, cough, weight loss, night sweats, and hemoptysis that does not respond to empiric antibiotics. Chest radiographs often reveal diffuse interstitial infiltrates lacking cardiomegaly, pleural effusions, and vascular redistribution; although it is often difficult to distinguish these features from cardiogenic pulmonary edema. In fewer than 10 percent of cases, blastomycosis has a fulminant course manifesting as fevers, chills, and shortness of breath, which can progress to ARDS.[6–9] Patients often require ventilator assistance within a few days of admission.
Meyer et alreported a 57-year-old man who presented with pain and swelling in his right elbow. On the second day of hospitalization, large numbers of broad-based budding yeast forms were identified on a wet mount of tracheal secretions and treatment ensued with AmB. Severe tachypnea and hypoxemia required the use of mechanical ventilatory support for 50 days. The patient’s recovery was slow and complicated, but he was discharged home after 75 days of hospitalization. Many studies highlight the extremely high mortality of ARDS secondary to blastomycosis dissemination.[35,48]
The most expeditious way to diagnose blastomycosis is to demonstrate the budding yeast on 10% KOH preparation, Gomori’s stain, periodic acid-Schiff stain, or Papanicolaou’s smear of tissue biopsy specimens, tracheal aspirates, bronchoalveolar lavage fluid, or sputum.[15,22,49,50] B. dermatitidis appears as single or budding spherical cells, 8 to 15µm in diameter, with thick cell walls and daughter cells that are nearly as large as the mother cell before separation.[1,51] KOH preparations should be followed by tissue cytological analysis or fungal culture on Sabouraud dextrose agar at room temperature. The latter is the most accurate method of diagnosis, although results can require up to four weeks.[46,49,52,53] Multiple authors have demonstrated that high diagnostic yields can be obtained from culture of specimens, regardless of the method of collection.[54,55] Although microscopic broad-based budding yeast is often diagnostic, fungal cultures of skin biopsies should always be done, especially when microscopy is negative or inconclusive. Skin testing and serodiagnosis of blastomycosis currently have very limited roles in diagnosis because of poor sensitivity and specificity as a result of cross-reactivity with other fungi.[33,56,57] In two large series of culture-proven blastomycosis, 85 to 100 percent of patients had negative blastomycin skin tests. Recently developed enzyme immunoassay (EIA) using a yeast phase antigen (A antigen) of B. dermatitidis has been shown to be more sensitive; however, its use is limited due to poor availability. Klein et al described antibody detection by complement fixation, immunodiffusion, and EIA to be 9 percent, 28 percent, and 77 percent, respectively. Thus, a negative test result should not exclude a diagnosis of blastomycosis and a positive test result requires further examination by microscopy or culture. Klein and Jones have isolated a surface protein of the fungus useful in detection of antibodies in patients in a research setting.
In cases presenting with cutaneous manifestations, skin biopsy with histological hematoxylin and eosin (H&E) analysis and silver stain may reveal the organism.[59–63] Skin biopsy shows histologic evidence of papillomatosis, downward proliferation of the epidermis with intraepidermal microabscesses, and an inflammatory or granulomatous reaction in the dermis.[64,65] The hyperplasia and acanthosis may suggest other diagnoses unless fungi are sought with specific stains. The histological changes may prompt an erroneous diagnosis of squamous cell carcinoma or keratoacanthoma.
Various antifungal drugs are available for the treatment of blastomycosis. Before antifungal therapy was available, the fatality rate among patients with disseminated blastomycosis was 21 to 78 percent.[63–65] However, fatality rates dropped significantly after the introduction of AmB in 1956.[66–69] Cases of patients with localized blastomycosis who spontaneously recovered without antifungal therapy have been reported.[4,70] Nonetheless, oral antifungal agents have become the standard of care for inoculation or pulmonary blastomycosis and AmB the standard of care for disseminated disease.
Important consideration should be given to three factors when deciding upon the appropriate treatment for a patient with blastomycosis: the clinical presentation and the severity of disease, the immune status of the patient, and the toxicity of the antifungal agent. In the immunocompetent host, acute blastomycosis may be mild or self-limited requiring treatment only to prevent extrapulmonary dissemination. Patients presenting with severe pneumonia or ARDS, disseminated infection, or those who are immunocompromised, require aggressive antifungal therapy. In 2007, a panel of infectious disease specialists from North America with expertise in blastomycosis met to develop guideline recommendations for the treatment of blastomycosis based on results from several prospective, multicenter treatment trials of individual antifungal agents (Table 2).
Itraconazole is now considered the agent of choice for non-life-threatening blastomycosis with fluconazole, voriconazole, and posaconazole having a role in selected patients. In 1976, a multicentered clinical trial of low-dose (400mg/day) compared to high-dose (800mg/day) ketoconazole for six months reported cure rates of 79 and 100 percent, respectively.[72–76] However, relapse rates were more common after ketoconazole (10–14%) as compared to AmB (4%). Thus patients treated with ketoconazole require close clinical follow up of one to two years after discontinuation. Compared with ketoconazole, itraconazole has enhanced antifungal activity and is first-line therapy for nondisseminated blastomycosis.[41,77] Bradsher et al noted success for a cohort of 42 patients treated with itraconazole at a dosage of 200mg/day. Cure rates of up to 90 percent have been reported after a six-month treatment regimen of 200–400mg/day of itraconazole. The same therapy is effective for primary pulmonary blastomycosis.
For disseminated blastomycosis, a total dosage of AmB >1g has resulted in cure without relapse in 77 to 91 percent of patients, and a total dosage >2g has resulted in cure rates of 97 percent.[49,79,80] Although not studied in controlled human trials, clinical experience suggests that lipid formulations of AmB are as effective as the deoxycholate formulation and are associated with less toxicity.[81–83] AmB is safe for use and equally effective in immunocompromised and pregnant hosts.
The major limiting factor to the use of these medications for the treatment of blastomycosis is the multiple significant adverse drug effects and serious drug interactions they present. AmB has been associated with decline in renal function leading to renal failure and anemia, and infusion-related toxicities such as fever, rigors, myalgia, headache, and anaphylaxis. Ketoconazole causes hormonal abnormalities, significant drug interactions, life-threatening arrhythmias, nausea and vomiting, and hepatitis.[2,84,85] Itraconazole is generally well tolerated, although side effects include pedal edema and congestive heart failure, hypokalemia, elevated liver enzymes, drug interactions, and torsade de pointes.[73,86–88]
While corticosteroids are recommended for the treatment of severe pulmonary infections with Pneumocystis jirovecii and Histoplasma capsulatum, no consensus exists regarding their role in the treatment of the host inflammatory response seen in pulmonary blastomycosis. Lahm et al reported two cases of pulmonary blastomycosis that quickly advanced to ARDS despite treatment with AmB at 1mg/kg/day. In both cases, the addition of methylprednisolone (60mg IV every 6 hours vs. 250mg IV every 6 hours) resulted in marked clinical improvement over the next 5 to 7 days. The authors concluded that although routine use of steroids in ARDS is not recommended, it may be initiated and show a benefit in a subset of patients who present with an exaggerated immune response. It is thought that a blastomycosis-induced hyperinflammation syndrome contributes to the clinical deterioration and respiratory failure despite adequate treatment with antifungal therapy. There is currently no recommendation on the use of corticosteroids in primary cutaneous fungal disease.
Blastomycosis has become an increasingly recognized serious infection that can present in any type of patient and may mimic many other conditions; thus, a high index of suspicion is required when assessing skin and pulmonary infections in areas endemic with B. dermatitidis. A thorough history and physical examination with microbiologic laboratory testing can assist the physician in making correct clinical and diagnostic decisions when presented with pertinent symptoms. We have described a case of a patient who presented with a nonhealing cutaneous lesion despite multiple surgical and medical treatments. Only after progression to ARDS was an accurate and swift diagnosis obtained. Although rare, progression to ARDS can have a strikingly high mortality rate. Prompt therapy with antifungal agents and possibly steroids can result in an improved outcome. Proper diagnosis relies on maintaining a high level of clinical suspicion and subsequent laboratory evaluation and initiation of appropriate therapy.
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