The LUFTSICHEL sign (from German, meaning air crescent) is due to the overinflated superior
segment of the ipsilateral lower lobe occupying the space between the
mediastinum and the medial aspect of the collapsed upper lobe, resulting in a
paramediastinal translucency.
The sign is more common on the left than the right and is regarded as a typical appearance of left upper lobe collapse.
(A) A left upper lobe collapse demonstrating paramediastinal lucency (arrow). (B) CT shows interposition of aerated lung between the collapse and the mediastinum (arrow). There is also a large right paratracheal node causing some distortion of the SVC.
The sign is more common on the left than the right and is regarded as a typical appearance of left upper lobe collapse.
(A) A left upper lobe collapse demonstrating paramediastinal lucency (arrow). (B) CT shows interposition of aerated lung between the collapse and the mediastinum (arrow). There is also a large right paratracheal node causing some distortion of the SVC.
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