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Insights into Imaging
Fig. 9 | Insights into Imaging

Fig. 9

From: Chest imaging using signs, symbols, and naturalistic images: a practical guide for radiologists and non-radiologists

Fig. 9

Doughnut sign. A lateral chest radiograph with the “doughnut sign”: the white arrows clearly demonstrate the presence of a white radiopaque ring at hilar region. It is created by enlarged lymph nodes at hilar and subcarinal region, located around intermedius bronchus, and normal profiles of right and left pulmonary arteries and aortic arch anteriorly and superiorly. This radiopaque ring resembles the appearance of a doughnut—as appreciable in the embedded figure. This sign could be suggestive of lymphadenopathy—in case of tuberculosis

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