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Disseminated nontuberculous mycobacterial infections in immunosuppressed patients
1Department of Radiology, University of Pennsylvania Medical Center, Philaldelphia 19104.
Abstract:
In summary, DNTM is an uncommon cause of infection in non-AIDS immunocompromised patients, but it is seen with increasing frequency as a late complication in AIDS patients who are severely debilitated. Non-AIDS patients may have pulmonary symptoms and parenchymal abnormalities on chest radiographs. These patients apparently may have clinically significant pulmonary infection. In contrast, AIDS patients with DNTM are unlikely to have clinically significant pulmonary disease. Although the lung is a common site of infection in these patients, they usually do not have pulmonary symptoms related to NTMB infection. Chest radiographs in these patients may show hilar or mediastinal adenopathy and/or pleural effusion. It is uncertain whether the parenchymal infiltrates noted in these patients are caused by NTMB or by coexisting processes. It is suspected that pulmonary NTMB in the AIDS patient is not likely to produce pulmonary parenchymal abnormalities on the chest radiograph.
Insights
Disseminated non-tuberculous mycobacteria (DNTM) infections are rare in non-AIDS immunocompromised individuals but increasingly affect severely debilitated AIDS patients. Pulmonary DNTM presents differently in these groups, with non-AIDS patients experiencing significant lung disease, unlike AIDS patients.
Area of Science:
- Infectious Diseases
- Pulmonology
- Immunocompromised Hosts
Background:
- Disseminated non-tuberculous mycobacteria (DNTM) infections are increasingly recognized, particularly in immunocompromised populations.
- The clinical presentation and radiographic findings of DNTM can vary significantly between patients with and without Acquired Immunodeficiency Syndrome (AIDS).
Purpose of the Study:
- To compare the clinical and radiographic manifestations of DNTM in non-AIDS immunocompromised patients versus AIDS patients.
- To elucidate the diagnostic challenges and implications of DNTM in different immunocompromised states.
Main Methods:
- This is a summary of existing knowledge and clinical observations regarding DNTM.
- Analysis of reported cases and clinical characteristics of DNTM in immunocompromised patients.
Main Results:
- DNTM is an uncommon cause of infection in non-AIDS immunocompromised patients, often presenting with pulmonary symptoms and radiographic abnormalities.
- In contrast, AIDS patients with DNTM, despite lung involvement, rarely have clinically significant pulmonary disease or typical radiographic findings; they more commonly exhibit hilar/mediastinal adenopathy or pleural effusion.
Conclusions:
- DNTM presents distinct clinical and radiographic patterns in non-AIDS immunocompromised individuals compared to AIDS patients.
- Pulmonary DNTM in AIDS patients is often asymptomatic or associated with non-specific radiographic findings, necessitating careful consideration of coexisting conditions.