Signet ring sign (bronchiectasis)

Last revised by Mateusz Wilczek on 9 Nov 2023

The signet ring sign is seen in bronchiectasis when the dilated bronchus and accompanying pulmonary artery branch are seen in cross-section. The bronchus and artery should be the same size, whereas in bronchiectasis, the bronchus is markedly dilated.

The signet ring sign has been also described in other unrelated pathologies.

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