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Opportunistic fungal pneumonia
J E Connolly1, H P McAdams, J J Erasmus
1Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Abstract:
Opportunistic fungal infection is a common cause of serious morbidity and mortality in immunocompromised patients. These infections occur primarily in patients with chemotherapy-induced neutropenia, acquired immunodeficiency syndrome. or immunosuppression after solid organ or bone marrow transplantation. The most important opportunistic fungal pathogens include Cryptococcus neoformans, Candida and Aspergillus species, and the fungi that cause mucormycosis. Opportunistic pneumonia caused by previously unrecognized pathogens, such as Fusarium, Penicillium, and the dematiaceous fungi, are increasingly reported. The clinical and radiologic features of opportunistic fungal pneumonia are highly variable and often nonspecific. Diagnosis requires knowledge of the various modes of presentation, radiologic manifestations, and epidemiology of these infections. Because many of these organisms can colonize the upper airway, sputum cultures are considered diagnostically unreliable. Instead, definitive diagnosis requires culture of the fungus from infected tissue or demonstration of the organism on microscopic examination.
Insights
Opportunistic fungal infections pose serious risks to immunocompromised patients, including those with neutropenia or post-transplant immunosuppression. Definitive diagnosis relies on tissue samples, not unreliable sputum cultures, for accurate identification of fungal pathogens.
Area of Science:
- Mycology
- Infectious Diseases
- Immunocompromised Host Research
Background:
- Opportunistic fungal infections are a significant cause of morbidity and mortality in immunocompromised individuals.
- These infections are prevalent in patients undergoing chemotherapy, with acquired immunodeficiency syndrome (AIDS), or post-transplantation immunosuppression.
- Key pathogens include Cryptococcus neoformans, Candida, Aspergillus, and agents of mucormycosis, with emerging threats from Fusarium, Penicillium, and dematiaceous fungi.
Purpose of the Study:
- To highlight the clinical and radiologic variability of opportunistic fungal pneumonia.
- To emphasize the diagnostic challenges posed by these infections.
- To underscore the importance of accurate diagnostic methods for timely intervention.
Main Methods:
- Review of clinical presentations and radiologic findings of opportunistic fungal pneumonia.
- Analysis of epidemiological data for various fungal pathogens.
- Evaluation of diagnostic techniques, including limitations of sputum cultures.
Main Results:
- Clinical and radiologic features of opportunistic fungal pneumonia are often nonspecific and highly variable.
- Sputum cultures are diagnostically unreliable due to common upper airway colonization by fungi.
- Definitive diagnosis necessitates culture from infected tissue or microscopic identification.
Conclusions:
- Accurate diagnosis of opportunistic fungal pneumonia requires understanding diverse presentations and epidemiology.
- Tissue culture or direct microscopic examination are essential for definitive diagnosis.
- Early and accurate diagnosis is critical for managing severe fungal infections in vulnerable patient populations.