Doughnut sign (chest)

The doughnut sign can be appreciated on the lateral chest radiograph of patients with mediastinal adenopathy, most commonly seen in pediatric patients with pulmonary tuberculosis infection1.

The sign is made up of precarinal, subcarinal and retrocarinal lymph nodes which surround the radiolucent trachea and upper lobe bronchi, giving the doughnut-like appearance.

Article information

rID: 87064
System: Chest
Section: Signs
Tag: cases
Synonyms or Alternate Spellings:
  • Donut sign

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