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Diagnosis of Pneumonia Due to Invasive Molds
Carlo Foppiano Palacios1, Anne Spichler Moffarah1
1Department of Medicine, Division of Infectious Diseases, Yale University School of Medicine, New Haven, CT 06519, USA.
Abstract:
Pneumonia is the most common presentation of invasive mold infections (IMIs), and is pathogenetically characterized as angioinvasion by hyphae, resulting in tissue infarction and necrosis. Aspergillus species are the typical etiologic cause of mold pneumonia, with A. fumigatus in most cases, followed by the Mucorales species. Typical populations at risk include hematologic cancer patients on chemotherapy, bone marrow and solid organ transplant patients, and patients on immunosuppressive medications. Invasive lung disease due to molds is challenging to definitively diagnose based on clinical features and imaging findings alone, as these methods are nonspecific. Etiologic laboratory testing is limited to insensitive culture techniques, non-specific and not readily available PCR, and tissue biopsies, which are often difficult to obtain and impact on the clinical fragility of patients. Microbiologic/mycologic analysis has limited sensitivity and may not be sufficiently timely to be actionable. Due to the inadequacy of current diagnostics, clinicians should consider a combination of diagnostic modalities to prevent morbidity in patients with mold pneumonia. Diagnosis of IMIs requires improvement, and the availability of noninvasive methods such as fungal biomarkers, microbial cell-free DNA sequencing, and metabolomics-breath testing could represent a new era of timely diagnosis and early treatment of mold pneumonia.
Insights
Diagnosing invasive mold infections (IMIs) like mold pneumonia is difficult due to non-specific symptoms and limited lab tests. New noninvasive methods are needed for timely diagnosis and treatment of these serious fungal infections.
Area of Science:
- Mycology
- Infectious Diseases
- Pulmonology
Background:
- Invasive mold infections (IMIs) commonly present as pneumonia, characterized by fungal angioinvasion, tissue infarction, and necrosis.
- Aspergillus species are the primary cause of mold pneumonia, followed by Mucorales species.
- High-risk populations include immunocompromised individuals, such as those with hematologic cancers, transplant recipients, and patients on immunosuppressive therapy.
Purpose of the Study:
- To highlight the diagnostic challenges associated with mold pneumonia.
- To emphasize the limitations of current diagnostic methods for invasive fungal infections.
- To advocate for the development and implementation of novel diagnostic approaches.
Main Methods:
- Review of current diagnostic modalities for mold pneumonia.
- Discussion of the limitations of clinical, imaging, and traditional laboratory tests.
- Exploration of emerging noninvasive diagnostic techniques.
Main Results:
- Clinical features and imaging findings for mold pneumonia are often nonspecific.
- Current laboratory tests, including cultures and PCR, have limited sensitivity and timeliness.
- Tissue biopsies, while informative, pose risks to fragile patients.
Conclusions:
- Accurate and timely diagnosis of mold pneumonia remains a significant clinical challenge.
- A combination of diagnostic modalities is currently recommended to manage patients.
- Advancement in noninvasive diagnostics, such as fungal biomarkers and cell-free DNA sequencing, holds promise for early detection and treatment of IMIs.
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