What is the interlobular septum?
The interlobular septa (singular: interlobular septum) are located between the secondary pulmonary lobules and are continuous with both the subpleural interstitium (peripheral connective tissue) and the peribronchovascular interstitium (axial connective tissue) as well as the more delicate intralobular septa.
What is interlobular and Intralobular septal thickening?
Intralobular septal thickening is a form of interstitial thickening and should be distinguished from interlobular septal thickening. It is often seen as fine linear or reticular thickening. It has been described with several conditions of variable etiology which include. sarcoidosis 2. asbestosis 1.
What does interlobular septal thickening mean?
Discussion. Diffuse interlobular septal thickening (DIST) is a pattern of lung disease found on high-resolution thoracic CT scanning (HRCT or CTPA). It represents pathology in the periphery of the pulmonary lobules (ie, the interlobular septa).
What causes septal thickening?
The most common causes of interlobular septal thickening on HRCT are pulmonary edema, pulmonary hemorrhage, and lymphangitic spread of cancer, and smooth thickening is characteristic of all three.
What is the function of interlobular septum?
The intralobular septa (sing: septum) are delicate strands of connective tissue separating adjacent pulmonary acini and primary pulmonary lobules. They are continuous with the interlobular septa which surround and define the secondary pulmonary lobules.
What is septal in lungs?
Septal lines, also known as Kerley lines, are seen when the interlobular septa in the pulmonary interstitium become prominent. This may be because of lymphatic engorgement or edema of the connective tissues of the interlobular septa. They usually occur when pulmonary capillary wedge pressure reaches 20-25 mmHg.
What is meant by traction bronchiectasis?
Traction bronchiectasis is distortion of the airways secondary to mechanical traction on the bronchi from fibrosis of the surrounding lung parenchyma. Although the airways may become dilated in this situation, the other manifestations of bronchiectasis are lacking.
What is a septal?
The septum is the wall of tissue that separates the right ventricle of your heart from the left ventricle. Septal infarct is also called septal infarction. Septal infarct is usually caused by an inadequate blood supply during a heart attack (myocardial infarction).
Is there a septum in the lungs?
The alveolar septum separates adjacent alveoli in lung tissue. The minimal components of an alveolar septum consist of the basement membranes of alveolar-lining epithelium (mostly type I pneumocytes) and capillary endothelium.
What is Septae?
sep·ta (-tə) A thin partition or membrane that divides two cavities or soft masses of tissue in an organism: the nasal septum; the atrial septum of the heart.
What are the three types of bronchiectasis?
Three basic morphologic types of bronchiectasis that are recognized at CT are cylindrical, varicose, and cystic (Fig 2), and many patients have a combination of these three classic types.
What does it mean to have an interlobular septum?
interlobular septum. in·ter·lob·u·lar sep·tum. the connective tissue between secondary pulmonary lobules, usually containing a vein and lymphatics; seen radiographically when thickened as a Kerley B or septal line.
What is the medical definition of the interlobular?
Medical Definition of interlobular. : lying between, connecting, or transporting the secretions of lobules interlobular connective tissue interlobular ducts of the pancreas.
Where is the interlobular septa located in the lungs?
The interlobular septa (sing: septum) are located between the secondary pulmonary lobules and are continuous with both the subpleural interstitium (peripheral connective tissue) and the peribronchovascular interstitium (axial connective tissue) as well as the more delicate intralobular septa.
What causes the thickening of the interlobular septa?
Pleura and interlobular septa are thickened by neutrophils, fibrin and edema. The fibrosis is mainly seen beneath the pleura and along the interlobular septum (Figure 2, A). The differential diagnosis of US B-lines includes cardiac manifestions caused by the thickening of the interlobular septa, such as in pulmonary edema.