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Opportunistic fungal pneumonias in cancer patients
Abstract:
The chest radiographic abnormalities in 92 patients with autopsy proven fungal pneumonias (Candida, 50 patients; Aspergillus, 35 patients; Mucoraceae, four patients; Cryptococcus, two patients; and Histoplasma, one patient) in immunosuppressed cancer patients were reviewed, Aspergillus and Mucoraceae most commonly produced solitary or multiple regions of rounded pneumonia that slowly increased in size and/or number and ultimately produced hemorrhagic pulmonary infarctions. Candida most commonly produced a radiographically nonspecific bronchopneumonia. Any of the fungi may produce a miliary-nodular pattern on the chest radiograph. The miliary-nodular pattern was more frequently seen with Candida. All of these radiographic patterns are nonspecific and may be mimicked by other pathologic processes. However, when placed in the proper clinical setting, the findings become much more specific. They tend to develop at the nadir of the patients' chemotherapeutic induced leukopenia and occur most commonly in patients with hematologic malignancies who have received extensive broad-spectrum antibiotics.
Insights
Chest X-ray findings in immunosuppressed cancer patients with fungal pneumonia are often nonspecific. However, specific patterns can emerge, especially in those with hematologic malignancies and leukopenia.
Area of Science:
- Radiology
- Mycology
- Oncology
Background:
- Fungal pneumonias are a significant concern in immunocompromised cancer patients.
- Accurate diagnosis relies on integrating radiographic findings with clinical context.
Purpose of the Study:
- To review chest radiographic abnormalities in autopsy-proven fungal pneumonias.
- To correlate specific fungal species with distinct radiographic patterns.
Main Methods:
- Retrospective review of chest radiographs from 92 cancer patients with autopsy-confirmed fungal pneumonia.
- Analysis of radiographic findings associated with Candida, Aspergillus, Mucoraceae, Cryptococcus, and Histoplasma infections.
Main Results:
- Aspergillus and Mucoraceae commonly presented as slowly enlarging rounded pneumonia, potentially leading to pulmonary infarction.
- Candida typically manifested as nonspecific bronchopneumonia.
- A miliary-nodular pattern was observed across fungi, more frequently with Candida.
- Radiographic findings are nonspecific but become more specific in the context of chemotherapy-induced leukopenia and hematologic malignancies.
Conclusions:
- Chest radiography plays a role in diagnosing fungal pneumonias in immunocompromised patients.
- Recognizing specific patterns associated with fungal species can aid diagnosis.
- Clinical correlation, particularly concerning leukopenia and hematologic malignancy, is crucial for accurate interpretation.