Septal Lines [top] 🚀

The visibility of septal lines is almost always a sign of pathology. The thickening occurs through three primary mechanisms:

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Kerley B lines are short, horizontal, straight lines typically seen at the lung bases, perpendicular to the pleural surface. They represented the first clinical visualization of the interlobular septa. Kerley also described A lines (longer lines pointing toward the hila, representing distended lymphatics) and C lines (a spiderweb network), but it is the B lines that have endured as the classic textbook description of septal thickening. septal lines

Septal lines are thin, linear opacities seen on chest radiographs (and HRCT) that represent thickening of the —the connective tissue partitions between the secondary pulmonary lobules. They are a hallmark of interstitial lung disease , specifically indicating fluid, cellular infiltration, or fibrosis in the pulmonary interstitium. The visibility of septal lines is almost always