Related Experiment Video
Updated: Aug 13, 2026

International Expert Consensus and Recommendations for Neonatal Pneumothorax Ultrasound Diagnosis and Ultrasound-guided Thoracentesis Procedure
Published on: March 12, 2020
Torsion of the upper lobe in pneumothorax
Y M Berkmen1, D Yankelevitz, S D Davis
1Department of Radiology, New York Hospital-Cornell Medical Center, NY 10021.
Abstract:
A rounded density is occasionally seen hanging down from the hilus in the presence of a large pneumothorax. To find an explanation for this appearance, the authors obtained a right-sided bronchogram on a baboon, after which they induced pneumothorax on the same side. This experiment demonstrated that the rounded density is formed by a twisted and atelectatic upper lobe.
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