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Influenza Pneumonia
Carlos S. Restrepo, MD; Helen T. Winer-Muram, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            • Diagnostic Checklist

              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

                                      1. 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
                                      2. Kalil AC et al: Influenza virus-related critical illness: pathophysiology and epidemiology. Crit Care. 23(1):258, 2019
                                      3. Cavallazzi R et al: Influenza and viral pneumonia. Clin Chest Med. 39(4):703-21, 2018
                                      4. Koo HJ et al: Radiographic and CT features of viral pneumonia. Radiographics. 38(3):719-39, 2018
                                      5. 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
                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Terminology

                                        • Imaging

                                          • Top Differential Diagnoses

                                            • Pathology

                                              • Clinical Issues

                                                • Diagnostic Checklist

                                                  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

                                                                          1. 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
                                                                          2. Kalil AC et al: Influenza virus-related critical illness: pathophysiology and epidemiology. Crit Care. 23(1):258, 2019
                                                                          3. Cavallazzi R et al: Influenza and viral pneumonia. Clin Chest Med. 39(4):703-21, 2018
                                                                          4. Koo HJ et al: Radiographic and CT features of viral pneumonia. Radiographics. 38(3):719-39, 2018
                                                                          5. 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