Bilateral pneumothoraces with deep sulcus sign
Acute severe shortness of breath. No trauma.
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Both the extreme apices and costophrenic angles are excluded from the image.
Large bilateral pneumothoraces.
Although the costophrenic angles are excluded from the image, the deep sulcus sign is evident bilaterally.
The lungs are collapsed.
Large nontraumatic bilateral pneumothoraces are uncommon. No mediastinal shift is evident as the bilateral pneumothoraces equilibrate any shift.
The chest cannot be totally covered on the image, but the supine projection indicates bilateral deep sulci, a typical feature in this projection.