Medicine:Sail sign of the chest

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Sail sign of the chest
Differential diagnosisleft lower lobe collapse

On a chest X-ray, the sail sign is a radiologic sign that suggests left lower lobe collapse.[1] In children, however, a sail sign could be normal, reflecting the shadow of the thymus.[2]

The thymic sail sign or spinnaker-sail sign is due to elevation of the thymic lobes in the setting of pneumomediastinum.[3]

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