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Pulmonary cryptococcosis
1Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710.
Abstract:
Cryptococcus neoformans is a ubiquitous soil fungus that rarely causes pneumonia in normal hosts but is a common cause of opportunistic infection. Pulmonary disease is initiated by inhalation of the organism, and a spectrum of radiographic manifestations can be seen. The most common finding is a poorly marginated nodule or mass. Lobar or segmental parenchymal opacities and, less commonly, a diffuse scattered nodular or reticulonodular pattern have also been observed. Associated adenopathy, pleural effusions, and cavitation are uncommon; when present, these are more common in immunocompromised patients. Establishing the diagnosis can be difficult, but pulmonary cryptococcosis should be considered in the differential diagnosis of patients in the proper clinical setting and with compatible radiographic findings.
Insights
Pulmonary cryptococcosis, caused by the fungus Cryptococcus neoformans, presents varied radiographic findings. Early diagnosis is crucial, especially in immunocompromised individuals, for effective treatment of this opportunistic infection.
Area of Science:
- Medical Mycology
- Pulmonology
- Infectious Diseases
Background:
- Cryptococcus neoformans is a soil fungus.
- It causes opportunistic infections, particularly pneumonia in immunocompromised hosts.
- Pulmonary disease arises from inhaling the fungus.
Purpose of the Study:
- To describe the spectrum of radiographic manifestations of pulmonary cryptococcosis.
- To highlight diagnostic challenges and clinical considerations.
- To emphasize the importance of considering this diagnosis in at-risk patients.
Main Methods:
- Review of radiographic findings in patients with pulmonary cryptococcosis.
- Correlation of imaging findings with host immune status.
- Analysis of diagnostic difficulties.
Main Results:
- Common radiographic findings include poorly marginated nodules or masses.
- Lobar/segmental opacities and diffuse nodular patterns are also observed.
- Adenopathy, effusions, and cavitation are less common, especially in immunocompetent hosts.
Conclusions:
- Pulmonary cryptococcosis exhibits diverse radiographic presentations.
- Diagnosis can be challenging, requiring consideration in appropriate clinical contexts.
- Radiographic findings, particularly in immunocompromised patients, warrant further investigation for Cryptococcus neoformans.