Lines on a posteroanterior chest radiographBMJ 2015; 350 doi: https://doi.org/10.1136/bmj.h1437 (Published 18 March 2015) Cite this as: BMJ 2015;350:h1437
- Michael Paddock, National Institute for Health Research academic clinical fellow in clinical radiology
- 1Academic Unit of Radiology, University of Sheffield, Royal Hallamshire Hospital, Sheffield S10 2JF, UK
- Correspondence to: M Paddock
Identify the structures labelled A, B, C, D, and E on this posteroanterior chest radiograph of a man⇓.
A: Right companion shadow
B: Right paratracheal stripe
C: Posterior junctional line
D: Anterior junctional line
E: Azygo-oesophageal line
Recognition of these lines as normal radiological anatomy is important given that abnormal appearances may indicate disease. In addition, it allows development of an appropriate differential diagnosis before obtaining further imaging.1
A: Right companion shadow: this is a smooth, thin, well defined shadow that runs parallel to the upper edge …
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