Fig. 17
From: Beyond bronchitis: a review of the congenital and acquired abnormalities of the bronchus
Bronchial obstruction due to neoplasm. Coronal CT imaging of metastatic renal carcinoma before (a) and after (b) chemotherapy. Note that prior to chemotherapy (a) there is obstruction of the left main bronchus with an air fluid level (dashed arrow) and complete collapse of the left lung. After several rounds of chemotherapy (b) the endoluminal metastatic renal cell carcinoma is now seen (arrowhead) and is no longer obstructive with interval re-expansion of the left lung