Lung lobe Torsion

27 April, 2021

Case example

A case with a twist

A 10- year-old schnauzer was presented with a chronic cough of months duration

CT findings

  • A large amount of fluid attenuating material is within the dependent aspect of the pleural space bilaterally. (Image 1)
  • The right middle lung lobe is enlarged, and its bronchial lumen is focally, completely narrowed. (Image 1)
  • Vesicular emphysema and a focally enlarged bronchus are also associated with this lung lobe. (Image 2)
  • The right middle pulmonary parenchyma is non-contrast enhancing.


  • Conclusions: Lung lobe torsion of the right middle lobe with bilateral pleural effusion

Learning points

  • The right middle lung lobe is the most commonly affected lobe in large breed dogs.
  • Radiographic und CT characteristics: Enlargement and consolidation of the affected lung lobe, vesicular emphysema, lack of contrast enhancement, secondary pleural effusion

More information

  • Radiographs vs CT: pathognomonic focal narrowing of the bronchus on CT
  • »Computes tomographic features of lung lobe torsion.«
    — Vet Radiol Ultrasound 2008;49(6):504-8.
  • »Usefulness of CT imaging for segmental lung lobe torsion without typical radiographic imaging in a Pomeranian.«
    — J Vet med Sci 2015;77(2):229-31.
  • »Radiographic diagnosis of lung lobe torsion.«
    — Vet Radiol Ultrasound 2005;46(6):478-484.

Images courtesy of the Tierklinik Bockenheim, Germany.