| 单词 | knob sign |
| 释义 | knob signknob signA reduced or absent aortic “knob” on a plain AP chest film, a finding typical of secondary atelectasis of the left lower lobe of lung.knob signImaging A ↓ or absent aortic 'knob' on a plain AP CXR, a finding typical of 2º atelectasis of the left lower lobe of lung |
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