Kerley A Vs B Lines !exclusive! -

| Feature | Kerley A Lines | Kerley B Lines | |---------|---------------|----------------| | | “Butterfly” or “apical” lines | “Septal” lines | | Length | 2–6 cm | 1–2 cm | | Shape | Long, unbranched, straight | Short, horizontal, parallel | | Location | Central → upper/mid zones, pointing toward hilum | Peripheral → lung bases, especially costophrenic angles | | Orientation | Radiating from hilum | Perpendicular to pleura (horizontal) | | Width | ~0.5–1 mm | ~0.5–1 mm | | Histology | Fluid in deep interlobular septa (anastomosing lymphatics) | Fluid in peripheral interlobular septa | | Clinical note | Less common; often indicates more acute or severe edema | Most common septal line; earliest sign of interstitial edema |

Although most commonly associated with , these lines can appear in several other conditions: kerley a vs b lines

Would you like example chest X-ray images annotated for Kerley A and B lines, or a mnemonic to remember the difference? | Feature | Kerley A Lines | Kerley