Kerley B lines are not a disease but a . Their presence indicates:
: Found at the lung periphery, typically at the bases near the costophrenic angles. Orientation : They run perpendicular to the pleural surface . pulmonary edema kerley b lines
| Finding | Distinguishing Feature | |--------|------------------------| | | Longer (2–6 cm), central, radiating from hilum (less specific) | | Plate atelectasis | Thicker, often longer, may change over days | | Scarring / fibrosis | Irregular, may be associated with volume loss | | Prominent vessels | Branching, continuous with hilar structures | Kerley B lines are not a disease but a
Physiologically, Kerley B lines represent the accumulation of fluid within the —the connective tissue walls that separate the secondary pulmonary lobules (the functional units of the lung). prominent pulmonary vasculature
Not every short line in the lung base is a Kerley B line. Consider:
A 68-year-old man with a history of hypertension and chronic kidney disease presents with progressive dyspnea on exertion and orthopnea for 3 days. Cardiomegaly, prominent pulmonary vasculature, and bilateral short horizontal lines in the costophrenic angles. Diagnosis: Acute decompensated heart failure with interstitial edema. Treatment: IV furosemide. Follow-up X-ray (48 hours later): Clear lung fields, Kerley B lines resolved.
Think of them as "ladder rungs" on the side of the lung, or short "dashes" written on the margin of the lung.