The following chest x-rays are from a neonate with respiratory distress. What condition and interesting radiological sign can you observe?

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The chest x-rays show the spinnaker sign which is a radiological finding in neonatal pneumomediastinum.

Also referred to as the thymic wing sign, it indicates lobes of the thymus displaced laterally by the mediastinal air, resembling the headsails of a boat.

This neonate was managed conservatively by the specialist and responded well.

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