Kerley's A line. 就是由垂直肺周邊、朝著hilar的、大約是2cm的線。
These are longer (at least 2cm) unbranching lines coursing diagonally from the periphery toward the hila in the inner half of the lungs. Kerley A lines are less commonly seen than Kerley B lines. Kerley A lines are never seen without Kerley B or C lines also present.
Kerley's b line. 即是肺周邊、水平的短線（常短於1cm）。
These are short parallel lines at the lung periphery. These lines represent interlobular septa, which are usually less than 1 cm in length and parallel to one another at right angles to the pleura. Kerley B lines are seen in Congestive Heart Failure (CHF) and Interstitial Lung Diseases (ILD).
Kerley's c line.最不常見的線，短、細，朝著橫隔。
These are the least commonly seen of the Kerley lines. They are short, fine lines.
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