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[American pulmonary histoplasmosis caused by Histoplasma capsulatum]
J Guigay1, A Cuguillière, J Miltgen
1Service de Pneumologíe, Hôpital d'Instruction des Armées Percy, Clamart.
Abstract:
American pulmonary histoplasmosis is a deep mycosis imported from North America caused by the inhalation of Histoplasma capsulatum. It is endemic in several countries throughout the world and occasional cases have been reported in France, mainly imported from out lying French territories. The most frequent clinical forms observed in immunocompetent subjects are generally benign or silent and usually limited to a fortuitously discovered pulmonary nodule. Massive exposure may lead to an acute primary invasion producing a miliary aspect. Chronic forms simulating tuberculosis are exceptional. Inversely, opportunistic histoplasmosis in AIDS patients can produce an severe multiple organ disease. Ideally, mycelium should be isolated for diagnosis, a task which is easier in disseminated or operated nodular forms. More often, the epidemiological context, clinical and radiological features, the elimination of differential diagnoses and, retrospectively, serology are sufficient for diagnosis. The clinical course is usually favorable. Itraconazole is the treatment of choice for symptomatic or complicated forms.
Insights
Pulmonary histoplasmosis, caused by Histoplasma capsulatum, is a fungal infection primarily seen in North America. While often benign in immunocompetent individuals, it can be severe in AIDS patients, with itraconazole being the preferred treatment.
Area of Science:
- Mycology
- Infectious Diseases
- Pulmonology
Background:
- American pulmonary histoplasmosis is a deep fungal infection caused by inhaling Histoplasma capsulatum spores.
- It is endemic in North America and occasionally reported in France, often imported from French territories.
- Clinical presentations range from asymptomatic pulmonary nodules to severe disseminated disease in immunocompromised individuals.
Purpose of the Study:
- To describe the epidemiology, clinical manifestations, diagnosis, and treatment of American pulmonary histoplasmosis.
- To highlight the varied clinical spectrum of the disease based on host immune status.
- To provide guidance on diagnostic approaches and therapeutic choices.
Main Methods:
- Review of clinical cases and literature on pulmonary histoplasmosis.
- Analysis of diagnostic methods including direct microscopy, culture, and serology.
- Evaluation of treatment outcomes with antifungal agents, particularly itraconazole.
Main Results:
- Most common in immunocompetent individuals is a benign pulmonary nodule.
- Massive exposure can lead to acute miliary disease.
- Opportunistic infections in AIDS patients often present as severe, multi-organ disease.
- Diagnosis relies on a combination of clinical, radiological, and epidemiological factors, with culture being ideal but often difficult.
- Serology can be useful retrospectively.
Conclusions:
- Pulmonary histoplasmosis has a variable clinical course, generally favorable but potentially severe in immunocompromised patients.
- Early diagnosis and appropriate treatment, typically with itraconazole, are crucial for managing symptomatic or complicated cases.
- Awareness of endemic areas and risk factors is important for timely diagnosis, especially in travelers returning from affected regions.