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lüll Viral pneumonias in adults: radiologic and pathologic findings Kim EA; Lee KS; Primack SL; Yoon HK; Byun HS; Kim TS; Suh GY; Kwon OJ; Han JRadiographics 2002[Oct]; 22 Spec No (ä): S137-49Numerous viruses, including influenza virus, measles virus, Hantavirus, adenovirus, herpesviruses, varicella-zoster virus, cytomegalovirus, and Epstein-Barr virus, can cause lower respiratory tract infection in adults. Viral pneumonia in adults can be classified into two clinical groups: so-called atypical pneumonia in otherwise healthy hosts and viral pneumonia in immunocompromised hosts. Influenza virus types A and B cause most cases of viral pneumonia in immunocompetent adults. Immunocompromised hosts are susceptible to pneumonias caused by cytomegalovirus, herpesviruses, measles virus, and adenovirus. The radiographic findings, which consist mainly of patchy or diffuse ground-glass opacity with or without consolidation and reticular areas of increased opacity, are variable and overlapping. Computed tomographic findings, which are also overlapping, consist of poorly defined centrilobular nodules, ground-glass attenuation with a lobular distribution, segmental consolidation, or diffuse ground-glass attenuation with thickened interlobular septa. The radiologic findings reflect the variable extents of the histopathologic features: diffuse alveolar damage (intraalveolar edema, fibrin, and variable cellular infiltrates with a hyaline membrane), intraalveolar hemorrhage, and interstitial (intrapulmonary or airway) inflammatory cell infiltration. Clinical information such as patient age, immune status, community outbreaks, symptom onset and duration, and presence of a rash remain important aids in diagnosis of viral causes.|Adenovirus Infections, Human/diagnostic imaging/pathology[MESH]|Female[MESH]|Hantavirus Pulmonary Syndrome/diagnostic imaging/pathology[MESH]|Herpesviridae Infections/diagnostic imaging/pathology[MESH]|Humans[MESH]|Influenza, Human/diagnostic imaging/pathology[MESH]|Male[MESH]|Measles/diagnostic imaging/pathology[MESH]|Pneumonia, Viral/*diagnostic imaging/etiology/*pathology[MESH]|Radiography[MESH] |