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Secondary Pulmonary Lobule
Melissa L. Rosado-de-Christenson, MD, FACR
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KEY FACTS

  • Terminology

    • Imaging

      TERMINOLOGY

      • Abbreviations

        • Secondary pulmonary lobule (SPL)
      • Definitions

        • Primary pulmonary lobule
          • Alveolar ducts, alveolar sacs, and alveoli distal to last respiratory bronchiole
          • No imaging significance
        • SPL
          • Smallest discrete unit of lung structure
            • Marginated by connective tissue septa
            • Supplied by lobular bronchiole and pulmonary artery
        • Pulmonary acinus
          • Lung distal to terminal bronchiole including: Respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli
          • Largest pulmonary unit (6-10 mm in diameter) in which all airways participate in gas exchange

      IMAGING

      • General Features

        • Components

          • Boundaries

            • Imaging of Normal Secondary Pulmonary Lobule

              • Imaging of Abnormal Secondary Pulmonary Lobule

                Selected References

                1. Hansell DM et al: Fleischner Society: glossary of terms for thoracic imaging. Radiology. 246(3):697-722, 2008
                2. Webb WR: Thin-section CT of the secondary pulmonary lobule: anatomy and the image--the 2004 Fleischner lecture. Radiology. 239(2):322-38, 2006
                Related Anatomy
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                Related Differential Diagnoses
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                References
                Tables

                Tables

                KEY FACTS

                • Terminology

                  • Imaging

                    TERMINOLOGY

                    • Abbreviations

                      • Secondary pulmonary lobule (SPL)
                    • Definitions

                      • Primary pulmonary lobule
                        • Alveolar ducts, alveolar sacs, and alveoli distal to last respiratory bronchiole
                        • No imaging significance
                      • SPL
                        • Smallest discrete unit of lung structure
                          • Marginated by connective tissue septa
                          • Supplied by lobular bronchiole and pulmonary artery
                      • Pulmonary acinus
                        • Lung distal to terminal bronchiole including: Respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli
                        • Largest pulmonary unit (6-10 mm in diameter) in which all airways participate in gas exchange

                    IMAGING

                    • General Features

                      • Components

                        • Boundaries

                          • Imaging of Normal Secondary Pulmonary Lobule

                            • Imaging of Abnormal Secondary Pulmonary Lobule

                              Selected References

                              1. Hansell DM et al: Fleischner Society: glossary of terms for thoracic imaging. Radiology. 246(3):697-722, 2008
                              2. Webb WR: Thin-section CT of the secondary pulmonary lobule: anatomy and the image--the 2004 Fleischner lecture. Radiology. 239(2):322-38, 2006