The signet ring sign.
Ouellette
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Faculty of Radiology, Ottawa Hospital, Ontario, Canada.
D001980:Bronchi / Q000473:pathology; D001987:Bronchiectasis / Q000000981:diagnostic imaging* / Q000473:pathology; D001995:Bronchography; D006801:Humans; D011651:Pulmonary Artery / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed