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Test Findings

Kerley Lines

October 21st, 2019


The interlobular septa are not normally seen on chest x-rays. Thickening of interlobular septa seen on chest x-ray is referred to as Kerley lines, of which there are three types.
  • Interpretation

  • Kerley A lines - 5-10cm lines extending from the hila to the periphery (fluid in the deep septa)
  • Kerley B lines - 1-2cm lines seen in the periphery of the lower lung extending into the pleura (interlobular septal thickening)
  • Kerley C lines - small, fine lines not in keeping with A or B lines
  • Causes of Kerley Lines

  • Pulmonary oedema
  • Interstitial pneumonia - viral pneumonitis, mycoplasma, pneumocystis
  • Neoplasia  - lymphangitis carcinomatosis, lymphoma
  • Sarcoidosis
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