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Azygos Fissure
Tomás Franquet, MD, PhD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            • Diagnostic Checklist

              TERMINOLOGY

              • Synonyms

                • Azygos fissure
              • Definitions

                • Accessory fissure surrounding portion of right upper lobe (RUL); lobe is supplied by branches of apical segmental bronchus
                • Variable size
                • Anomalous intrapulmonary course of azygos vein creating an accessory fissure
                  • 4 layers of pleura invaginating into lung apex
                  • Trigone
                    • Most cranial part of fissure (triangular shape)
                    • Determines size of lung medial to fissure
                  • Contains azygos vein within its lower margin

              IMAGING

              • Imaging Recommendations

                • Radiographic Findings

                  • CT Findings

                    DIFFERENTIAL DIAGNOSIS

                      PATHOLOGY

                      • General Features

                        CLINICAL ISSUES

                        • Presentation

                          • Demographics

                            DIAGNOSTIC CHECKLIST

                            • Image Interpretation Pearls

                              Selected References

                              1. Villanueva A et al: Migrating azygos vein and vanishing azygos lobe: MDCT findings. AJR Am J Roentgenol. 194(3):599-603, 2010
                              2. Maldjian PD et al: The empty azygos fissure: sign of an escaped azygos vein. J Thorac Imaging. 23(1):54-6, 2008
                              3. Shin MS et al: Clinical significance of azygos vein enlargement: radiographic recognition and etiologic analysis. Clin Imaging. 23(4):236-40, 1999
                              4. Caceres J et al: The azygos lobe: normal variants that may simulate disease. Eur J Radiol. 27(1):15-20, 1998
                              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

                                            • Azygos fissure
                                          • Definitions

                                            • Accessory fissure surrounding portion of right upper lobe (RUL); lobe is supplied by branches of apical segmental bronchus
                                            • Variable size
                                            • Anomalous intrapulmonary course of azygos vein creating an accessory fissure
                                              • 4 layers of pleura invaginating into lung apex
                                              • Trigone
                                                • Most cranial part of fissure (triangular shape)
                                                • Determines size of lung medial to fissure
                                              • Contains azygos vein within its lower margin

                                          IMAGING

                                          • Imaging Recommendations

                                            • Radiographic Findings

                                              • CT Findings

                                                DIFFERENTIAL DIAGNOSIS

                                                  PATHOLOGY

                                                  • General Features

                                                    CLINICAL ISSUES

                                                    • Presentation

                                                      • Demographics

                                                        DIAGNOSTIC CHECKLIST

                                                        • Image Interpretation Pearls

                                                          Selected References

                                                          1. Villanueva A et al: Migrating azygos vein and vanishing azygos lobe: MDCT findings. AJR Am J Roentgenol. 194(3):599-603, 2010
                                                          2. Maldjian PD et al: The empty azygos fissure: sign of an escaped azygos vein. J Thorac Imaging. 23(1):54-6, 2008
                                                          3. Shin MS et al: Clinical significance of azygos vein enlargement: radiographic recognition and etiologic analysis. Clin Imaging. 23(4):236-40, 1999
                                                          4. Caceres J et al: The azygos lobe: normal variants that may simulate disease. Eur J Radiol. 27(1):15-20, 1998