Torsion of the upper lobe in pneumothorax

Radiology. 1989 Nov;173(2):447-9. doi: 10.1148/radiology.173.2.2798876.


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.

MeSH terms

  • Animals
  • Female
  • Lung / diagnostic imaging
  • Lung Diseases / diagnostic imaging*
  • Lung Diseases / etiology
  • Papio
  • Pneumothorax / complications*
  • Pneumothorax / diagnostic imaging
  • Radiography, Thoracic
  • Torsion Abnormality / diagnostic imaging
  • Torsion Abnormality / etiology