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From the case:
Round atelectasis
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![](https://prod-images-static.radiopaedia.org/images/583699/d0bc097416bc2d4ed91cc72d309284_big_gallery.jpg)
Circumscribed left-sided subpleural atelectasis pulling the adjacent bronchovascular bundles (comet tail appearance). Note is also made of the associated pleural thickening (and possibly a small amount of effusion).
Case Discussion
CT of the chest demonstrates round atelectasis in the left base with a comet tail sign.
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