Figure 4. 74-year-old man with marked left lower lobe atelectasis due to bronchiectasis. (a) Posteroanterior radiograph shows a small hilum on the left and decreased vascular markings in the left lung. Lateral margin of the atelectatic left lower lobe can easily be mistaken for the descending aortic interface (arrowheads). (b) CT demonstrates a markedly atelectatic left lower lobe as a small opacity with air bronchogram in the left paravertebral region.

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