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Pulmonary histoplasmosis
1Department of Radiology, University of Nebraska Medical Center, Omaha, NE 68198-1045, USA.
Abstract:
Histoplasmosis is a common infection in the central United States and is acquired through inhalation of airborne spores. The majority of infected persons have an asymptomatic, self-limiting illness. Clinical pneumonia occurs in those with exposure to a large number of infecting spores. Resolution of the pneumonia often leaves calcified pulmonary nodules, calcified mediastinal lymph nodes, or splenic calcifications. Chronic disease, which mimics tuberculosis, may develop in those with underlying emphysema. In patients with deficient cell-mediated immunity, Histoplasma capsulatum may disseminate throughout the body; this often is fatal. Delayed manifestations arise months or years after the primary infection. Broncholithiasis occurs when peribronchial calcific nodes produce bronchial obstruction. Mediastinal granuloma is the continued proliferation of fibrous tissue in draining mediastinal lymph nodes. These granulomas may obstruct adjacent veins, arteries, or airways and lead to various clinical symptoms.
Insights
Histoplasmosis, a common fungal infection, is typically asymptomatic but can cause pneumonia or severe disseminated disease in immunocompromised individuals. Long-term complications include calcifications and airway obstruction from granulomas.
Area of Science:
- Infectious Diseases
- Pulmonary Medicine
- Mycology
Background:
- Histoplasmosis is a prevalent infection in the central US, contracted via airborne Histoplasma capsulatum spores.
- Most infections are asymptomatic or self-limiting, but significant exposure can lead to clinical pneumonia.
Purpose of the Study:
- To describe the clinical spectrum and potential long-term sequelae of Histoplasmosis.
- To highlight delayed manifestations and complications in both immunocompetent and immunocompromised individuals.
Main Methods:
- Review of clinical presentations and outcomes associated with Histoplasma capsulatum infection.
- Analysis of pathological findings including calcifications and granuloma formation.
- Examination of risk factors for disseminated disease and chronic manifestations.
Main Results:
- Pneumonia resolution frequently results in pulmonary nodules, mediastinal lymph node calcifications, or splenic calcifications.
- Chronic disease mimicking tuberculosis can occur, particularly in patients with underlying emphysema.
- Disseminated disease in immunocompromised individuals is often fatal; delayed complications like broncholithiasis and mediastinal granulomas can cause significant morbidity.
Conclusions:
- Histoplasmosis presents a wide spectrum of illness, from asymptomatic infection to life-threatening disseminated disease.
- Calcifications are common sequelae, while granulomas can lead to serious airway and vascular obstruction.
- Understanding these manifestations is crucial for diagnosis and management, especially in endemic areas and in at-risk populations.