Lunate trachea

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Lunate trachea is a rare variant of the trachea in inspiration where the trachea has a flattened shape said to resemble a crescent or moon. Normally the tracheal index (ratio of coronal to sagittal diameter) is less than 1, but with lunate trachea the ratio is greater than 1 .

It is a very specific but poorly sensitive sign of tracheomalacia .