Human influenza is RNA virus, categorized into types A, B and C, which can be subcategorized into several subtypes, e.g., influenza A: H1N1, H1N2, H2N1, H3N1, etc.; influenza B subtypes are B/Yamagata and B/Victoria lineages
Influenza pneumonia results from lung inflammation and compromise caused by direct viral infection of respiratory epithelium
IMAGING
General Features
Radiographic Findings
CT Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Microscopic Features
Laboratory Identification
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
DIAGNOSTIC CHECKLIST
Image Interpretation Pearls
Selected References
Lin L et al: CT manifestations of coronavirus disease (COVID-19) pneumonia and influenza virus pneumonia: a comparative study. AJR Am J Roentgenol. 216(1):71-9, 2021
Kalil AC et al: Influenza virus-related critical illness: pathophysiology and epidemiology. Crit Care. 23(1):258, 2019
Cavallazzi R et al: Influenza and viral pneumonia. Clin Chest Med. 39(4):703-21, 2018
Koo HJ et al: Radiographic and CT features of viral pneumonia. Radiographics. 38(3):719-39, 2018
Oikonomou A et al: Radiographic and high-resolution CT findings of influenza virus pneumonia in patients with hematologic malignancies. AJR Am J Roentgenol. 181(2):507-11, 2003
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TERMINOLOGY
Synonyms
Influenza A: Avian flu H5N1, swine flu H1N1
Definitions
Human influenza is RNA virus, categorized into types A, B and C, which can be subcategorized into several subtypes, e.g., influenza A: H1N1, H1N2, H2N1, H3N1, etc.; influenza B subtypes are B/Yamagata and B/Victoria lineages
Influenza pneumonia results from lung inflammation and compromise caused by direct viral infection of respiratory epithelium
IMAGING
General Features
Radiographic Findings
CT Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Microscopic Features
Laboratory Identification
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
DIAGNOSTIC CHECKLIST
Image Interpretation Pearls
Selected References
Lin L et al: CT manifestations of coronavirus disease (COVID-19) pneumonia and influenza virus pneumonia: a comparative study. AJR Am J Roentgenol. 216(1):71-9, 2021
Kalil AC et al: Influenza virus-related critical illness: pathophysiology and epidemiology. Crit Care. 23(1):258, 2019
Cavallazzi R et al: Influenza and viral pneumonia. Clin Chest Med. 39(4):703-21, 2018
Koo HJ et al: Radiographic and CT features of viral pneumonia. Radiographics. 38(3):719-39, 2018
Oikonomou A et al: Radiographic and high-resolution CT findings of influenza virus pneumonia in patients with hematologic malignancies. AJR Am J Roentgenol. 181(2):507-11, 2003
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