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Granulomatous Pneumocystis carinii in AIDS patients
1Department of Infectious and Parasitic Disease Pathology, Armed Forces Institute of Pathology, Washington, DC.
Abstract:
Seven cases of Pneumocystis carinii pneumonia with granulomatous reaction in patients infected with the human immunodeficiency virus are described. The patients were all adult men between the ages of 32 and 45 years, with different high-risk factors. Clinically, all the patients presented with a history of non-productive cough and shortness of breath. Two of the patients had a past history of pulmonary pneumocystosis. Radiologically, six patients had diffuse pulmonary infiltrates and one nodular pulmonary infiltrate. Transbronchial lung biopsies were obtained in four patients and open lung biopsies in three. All presented a predominant granulomatous reaction composed of epithelioid and multinucleated giant cells. Several other special stains to detect the presence of other microorganisms to account for the granulomatous reaction were negative.
Insights
Seven human immunodeficiency virus (HIV)-infected men developed Pneumocystis pneumonia with a granulomatous reaction. This rare presentation highlights an unusual immune response to Pneumocystis jirovecii in immunocompromised individuals.
Area of Science:
- Infectious Diseases
- Pulmonology
- Immunology
Background:
- Pneumocystis pneumonia (PCP) is a common opportunistic infection in patients with human immunodeficiency virus (HIV).
- A granulomatous reaction is an uncommon finding in PCP, typically associated with other infections or inflammatory conditions.
- This case series explores an unusual presentation of PCP in HIV-infected individuals.
Purpose of the Study:
- To describe seven cases of Pneumocystis pneumonia exhibiting a granulomatous reaction in HIV-infected patients.
- To characterize the clinical, radiological, and pathological features of this specific presentation.
- To differentiate this presentation from other causes of granulomatous lung disease in HIV.
Main Methods:
- Retrospective review of seven HIV-infected adult male patients.
- Analysis of clinical symptoms, including cough and dyspnea.
- Review of radiological findings (pulmonary infiltrates).
- Examination of transbronchial and open lung biopsy specimens, including special stains.
Main Results:
- All seven patients were adult men aged 32-45 with HIV and presented with cough and shortness of breath.
- Radiological findings included diffuse (6 cases) and nodular (1 case) pulmonary infiltrates.
- Lung biopsies revealed a predominant granulomatous reaction with epithelioid and multinucleated giant cells; other microbial stains were negative.
Conclusions:
- Pneumocystis pneumonia can present with a granulomatous reaction in HIV-infected individuals.
- This finding suggests an atypical host immune response to Pneumocystis jirovecii in some immunocompromised patients.
- Further investigation is needed to understand the mechanisms and clinical implications of granulomatous PCP.