you can see A paraaortic crescent of hyperlucency with sharp margins that extend from the apex of the left hemithorax to the left superior pulmonary vein.
This appearance may be seen on left upper lobe collapse and called : LUFTSICHEL sign ( A german word ; Luft = Air and Sichel = Sickle ) . The luftsichel sign represents the hyperexpanded superior segment of the left lower lobe interposed between the atelectatic left upper lobe and the aortic arch.
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Thanks for this nice case
Nice case ,thanks.
Thanks for this case Dr. Niknejad.
Tip: left upper lobe collapse may be not evident on PA chest radiograph and evident only by lateral radiograph as antero-superior displacement of longitudinal fissure.
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