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Fig. 4. —CT scan of tumor involvement of severe endobronchial stenosis without atelectasis in 64-year-old woman with tumor blocking left main pulmonary artery and upper lobe bronchus completely. Lower lobe bronchus had severe stenosis (arrow), but lower lung was not atelectatic. Lower lobe was calculated by quantitative CT histogram as 26% of functional lung (not shown) but had only 8% of total radioactivity on scintigraphy (not shown). Exact lung function loss was 10% after pneumonectomy.