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Quantitative Analysis of a Patient With a Tumor Causing Atelectasis of the Left Upper Lobe. (A): Chest CT scan. (B): Volumetric analysis of both lungs. Total functional lung volume is estimated to be 3972 mL. (C): Regional functional lung volume of the left upper lobe is only 9 mL due to the atelectasis. In this case, predicted postoperative FEV1 is very similar to the preoperative measurement.
