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Cytomegalovirus pneumonia: computed tomography findings
B C Aafedt1, R A Halvorsen, U Tylën
1Department of Radiology, University of Minnesota Hospital and Clinics, Minneapolis.
Summary
Cytomegalovirus (CMV) pneumonia in immunocompromised patients often shows nonspecific chest X-ray findings. This study found that while mixed alveolar and interstitial disease is common on CT scans, the appearances are varied and nonspecific.
Area of Science:
- Medical Imaging
- Pulmonology
- Infectious Diseases
Background:
- Cytomegalovirus (CMV) is a common respiratory pathogen in immunosuppressed individuals.
- Diagnosing CMV pneumonia typically requires invasive procedures like bronchopulmonary lavage or lung biopsy due to nonspecific chest radiograph findings.
- The computed tomography (CT) appearance of pure CMV pneumonia has been described in limited cases.
Purpose of the Study:
- To evaluate CT scans and chest radiographs of patients with CMV pneumonia.
- To determine if a characteristic CT appearance for CMV pneumonia exists.
- To analyze the type, severity, and distribution of parenchymal abnormalities on CT.
Main Methods:
- Retrospective review of CT scans and chest radiographs from eight patients diagnosed with CMV pneumonia.
- Detailed evaluation of parenchymal abnormalities, including alveolar and interstitial disease patterns.
- Comparison of CT findings with clinical and microbiological data.
Main Results:
- The most frequent CT finding was mixed alveolar and interstitial disease (7/8 patients).
- Alveolar disease predominated in most cases with mixed patterns (5/7 patients).
- Air-space disease alone was observed in one patient; interstitial disease alone was not seen.
Conclusions:
- The CT findings in CMV pneumonia are nonspecific, characterized by a variety of parenchymal abnormalities.
- Mixed alveolar and interstitial disease is the most common pattern, but not exclusive.
- Nonspecific CT findings necessitate further investigation for definitive CMV pneumonia diagnosis.