(A) Axial CT scan and (B) coronal section demonstrating Zephyr valve in a good position in the right upper lobe and (C) Zephyr valve poorly positioned.

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(A) Axial CT scan and (B) coronal section demonstrating Zephyr valve in a good position in the right upper lobe and (C) Zephyr valve poorly positioned in posterior segment of the right upper lobe where a patent adjacent segment is visible on the axial CT scan. (A) Axial CT scan and (B) coronal section demonstrating Zephyr valve in a good position in the right upper lobe and (C) Zephyr valve poorly positioned in posterior segment of the right upper lobe where a patent adjacent segment is visible on the axial CT scan. Pallav L Shah, and Felix J F Herth Thorax 2014;69:280-286 Copyright © BMJ Publishing Group Ltd & British Thoracic Society. All rights reserved.