Q: What are Fleischner lines on CXR?
Answer: Long linear bands of atelectasis in a hypoxic patient are called Fleischner lines. These are highly suspicious of unilateral or bilateral pulmonary embolism (PE), particularly if CXR is otherwise clear. These were described 50 years ago when CT angiographies to confirm PE were unavailable.
Unilateral or bilateral pleural effusions may also be present.
Baron MG. Fleischner lines and pulmonary emboli. Circulation. 1972 Jan;45(1):171-8. doi: 10.1161/01.cir.45.1.171. PMID: 5007031.
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