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| Condition | Distinguishing Features | | --- | --- | | | Plate-like atelectasis; usually thicker, more opaque, and do not reach pleura perpendicularly | | Scarring (old TB, fibrosis) | Associated volume loss, traction bronchiectasis | | Asbestosis | Pleural plaques, calcifications, rounded atelectasis | | Lymphoma or leukemia | Nodular septal thickening, lymphadenopathy | | Pneumonia | Air bronchograms, consolidations, not limited to septa |
Short, thin, horizontal linear opacities seen most commonly in the lung periphery (costophrenic angles). They are 1–2 cm long, <1 mm thick, and extend to the pleural surface. kerley b lines
Chronic fibrotic thickening of the interlobular septa can produce permanent “Kerley B-like” lines. In asbestosis, Kerley B lines are often seen along with pleural plaques and subpleural curvilinear lines. | Condition | Distinguishing Features | | ---
These lines represent , the connective tissue structures that separate the lung's secondary lobules. This thickening usually occurs due to: In asbestosis, Kerley B lines are often seen
The presence of Kerley B lines is strongly associated with conditions that cause lymphatic or venous drainage obstruction: Kerley B Lines in AIDS - CHEST Journal
For decades, radiologists debated the exact nature of Kerley B lines. Thanks to pathological correlation studies, we now know they represent —the connective tissue partitions that divide the lung into small anatomical units called secondary pulmonary lobules.